Sugino OX601D replacement chainrings

[jfrye]

Anyone who is running the Sugino OX601D crankset priced replacement rings lately. My big ring is looking a bit shark toothed after several thousand miles of gravel riding and I thought I'd replace it for fresh one. Anyone have a source for Sugino branded or compatible replacement rings? 

Cheers

Jayme

[Alex Wetmore]

The beautiful thing with that crank is that it takes 110/74 chainrings.  You can buy them from anyone.

Sugino has typically not made the most durable chainrings.  I would look for chainrings made with 7075 aluminum, not 6061.

alex

---

From: 65...@googlegroups.com <65...@googlegroups.com> on behalf of jfrye <jayme...@gmail.com>
Sent: Wednesday, February 18, 2015 2:20 PM
To: 65...@googlegroups.com
Subject: [650B] Sugino OX601D replacement chainrings

 

Anyone who is running the Sugino OX601D crankset priced replacement rings lately. My big ring is looking a bit shark toothed after several thousand miles of gravel riding and I thought I'd replace it for fresh one. Anyone have a source for Sugino branded or compatible replacement rings? 

Cheers

Jayme

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[nm matt]

i was wondering about rigs for these as well. as alex noted 110/74 bcd is wicked easy to source, but what about the milling/counterboring for a ring intended to be mounted on the outside, but mounted on the inside of the spider, as in this crankset? am i overthinking it?

[David Banzer]

I have a bunch of new 46t "middle" position chainrings (would be in the correct orientation mounted in the "outer" position on the Sugino OX601D).
7075 aluminum, no ramps/pins.
Any interest, I have them here: http://treetop.bigcartel.com/product/willow-chainring-110-bcd-46t-53t-options

Obvious disclaimer that I gain in very small increments monetarily by selling these.
I've been trying to lay off the sales pitch for these on lists, but it seemed appropriate for this crankset application.
Thanks,
David

[Nick Payne]

Any 110BCD middle chainring should fit. Don't buy an outer chainring, as
the countersunk holes for the mounting bolts will be on the wrong side
of the chainring. I'm running TA replacement rings on an OX801D set of
cranks.

[Dave Johnston]

I have a 40t or 42t Stronglight middle if you are interested in those sizes. 6000 series AL. Pins but no ramps. $30ea

-Dave

[jfrye]

Thanks all for the info. I scored a 42 TA ring from Harris Cyclery.

On Wednesday, February 18, 2015 at 4:20:41 PM UTC-6, jfrye wrote:

[Andrew Squirrel]

This is interesting info, I didn't realize the outer rings wouldn't work on OX601D cranks. It's too bad for those of us running 46t big rings and hoping to get some TA rings when the existing wear out.

[David Johnston]

TA makes middles up to 44t. That will get you over 100 gear inches.
Expensive but nice. I have a 43t on a bike and that seems plenty for
me.

-Dave

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[Andrew Squirrel]

Yeah, 44t would be too small for my use. I've even been considering jumping up to a 48t lately. Thanks.

[John Selway]

perhaps one could flip a larger non-ramped/pinned outer chainring?

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[Chris Cullum]

On Feb 20, 2015 2:41 PM, "John Selway" <sel...@gmail.com> wrote:
>
> perhaps one could flip a larger non-ramped/pinned outer chainring?
>

The offset of the ring might not be ideal and the shifting certainly would not be as good.

Would the chainring bolt protrude far enough to be a problem if the ring is not countersunk on the inside? Maybe a regular ring would be OK?

[Nick Payne]

The TA web site shows that they make 110BCD middle chainrings in sizes
up to 46t (http://www.specialites-ta.com/gb/plateau-zephyr.html), and
Spa Cycles have them listed on their web store:
http://www.spacycles.co.uk/products.php?plid=m2b0s113p1722.

[jfrye]

New rings came Saturday. Quick comparison pic of new TA ring and the Sugino ring it is replacing.

On Wednesday, February 18, 2015 at 4:20:41 PM UTC-6, jfrye wrote:

[Craig Drown]

I've just installed a TA Zephyr 44t outer on my OX601 crank and it's fine.
The bolts do protude, but there's (just) enough clearance that it doesn't matter.
The Zephyr rings are thinner than the stock Sugino ring which is 4.2 mm thick (!), so this gives extra clearance.
They're only about $40 from Wiggle and they look nicer and weigh less than the Sugino ring.
I have a 28t on the inside (also TA), so it's possible with a different inner ring you might get a different result (The inner ring is slightly asymmetrical, so it could be moved left .5mm by flipping it over I reckon, but not needed in my case.
Cheers,
Craig

[Michael Arciero]

Peter White has TA middles in 46t

[njh...@gmail.com]

You don't use a chainring intended as an outer ring for the large chainring on the OX601/801/901. You use a chainring intended as the middle chainring on a 110BCD triple crankset. Both TA and Sugino make these in sizes up to 46t.

Bike shops that specialize in tandems will often have the larger size of middle chainrings - our racing tandem uses 54/44/30 chainrings on a 110/74 BCD tandem crankset 

[satanas]

Spa Cycles in the UK have own-brand middle rings for a reasonable price, and as they sell a lot of Stronglight stuff I suspect these are very possibly Stronglight rings. The OEM Sugino rings have a lot more shaping and machining on the back side of the rings than either Spa or TA, so might well shift better, plus they're thicker and thus stiffer which should help upshifting under load, if one does that.

Later,
Stephen

[Craig Drown]

You don't use a chainring intended as an outer ring

But I do ;-)
My point was that it works fine- much easier to find 44t outers than middles I think, and TA price is good, and they look nice.
(And I also it's good to know that although TA Zephyr are rated for 10 speed, they work find with an 11 speed chain)
Cheers,
Craig

[Stephen Poole]

11 is okay, really? My experience with 10 speed and Zephyr rings was wretched shifting. Might I ask what the other ring is and what front derailleur and shift lever you have?

Thanks,
Stephen

On 20 May 2017 12:20 pm, "Craig Drown" <cdr...@gmail.com> wrote

> (And also it's good to know that although TA Zephyr are rated for 10 speed, they work fine with an 11 speed chain)
> Cheers,
> Craig

[Touko Maksimainen]

I gather that the general consensus here is that TA's Zephyr Middle chainring is an acceptable replacement for Sugino OEM CP110S. I also understand that the ramps on the Zephyr are not as elaborate as in the original, possibly resulting in inferior shifting? Also, would the middle not have the pin that guards against chain drop on the outside? Would that be a potential safety issue?

[Alex Wetmore]

I've been using a Zephyr ring on OX601D cranks for the 4 years since this thread was started and haven't had shifting or drop issues.  I do a downtube lever so my shifting is friction and not indexed -- indexed systems can be sensitive.

I have OX601D cranks with Sugino rings on another bike and don't notice a difference in shifting performance between the two (both are using the same downtube shifters and similar derailleurs).

I also like old Ritchey 94mm BCD doubles for subcompact cranks, but they are hard to find, use hard to find 103mm (or shorter) square taper bottom brackets, and good rings are harder to find.  The Sugino can be a good 1x crank because you can get nice narrow-wide rings for them.  I have a couple of these that I'll probably end up putting on eBay.  I think that the Ritchey looks a lot nicer -- the Sugino is really chunky in comparison and has ugly graphics.

-Alex

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From: 65...@googlegroups.com <65...@googlegroups.com> on behalf of Touko Maksimainen <pil...@gmail.com>
Sent: Sunday, March 28, 2021 6:02 AM
To: 650b <65...@googlegroups.com>
Subject: Re: [650B] Sugino OX601D replacement chainrings

 

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[ecar...@gmail.com]

Related to this thread, does anyone know of a good U.S. source for T.A. chainrings in the 104/64 bcd sizing? This is not for a Sugino crankset, but I've been thinking about getting a set of the T.A. Specialites Chinook rings. Peter White sells some that appear to be 9-speed specific. I'm looking for the 10/11 speed version with 18mm spider spacing. Are UK or France retailers the only option?

Eric

[njh...@gmail.com]

Both the Sugino OX801 chainset that my wife uses and the OX601 that I use have been running TA chainrings for several years with zero problems. She's running 39/26 and I'm running 42/28.

If you're looking for large 110BCD middle chainrings, look at shops that specialize in tandems or HPVs. You can get 100t chainrings if you want: http://trisled.com.au/product/100t-chainring/.

Nick

[ericni...@gmail.com]

For 110 BCD, a great choice is the Shimano CX70 chainring set. Only available in 46 outer and 36 inner. The ramps and pins on the outer are optimized to work next to a 36. I use them as the outer and middle on a triple. Best shifting triple I’ve ever used.

Eric in NH

[joe...@gmail.com]

I've got this same issue now: My 42T outer on my Sugino OX601D 42/26T is getting worn, especially after having used a chain beyond the point where it stretched. 

Nobody seems to have Sugino 42T rings for the OX601D in stock any more. From my notes the 110 BCD outer (as bought from Soma Fab) is a  PE110S while the 74 BCD inner is a  74J. I'm using 11-speed STI hydro brifters (ST-R8020-L for the front) so ramps and pins are a must for the large ring while any cheap 74 BCD ring will do as a 32 or smaller inner (I already have a spare 26T for that).

I no longer see PE110S rings listed on the Sugino website. For the current OX2-901D compact-plus cranks it lists CP110S rings, available in even sizes from 44-52 only, but not 42T. Would the OX2-901D rings work on the OX601D?

It looks like 44T for OX601D/OX801D may still be available from some sources, but that would increase my tooth gap to 18T, beyond the 16T max spec of the FD-CX70 so I imagine shift quality may decrease even if it works.

Also, a 44T would raise the gear inch range of my outer by 5% which makes it slightly less usable for me (i.e. gives me a taller top gear that I won't need while forcing the occasional front shift on a climb where I could have gotten away with large-large cross chaining with a 42T).

I will buy a different source 42T if it shifts well with brifters (no bar end or downtube shifters). I will go for a 44T if I can't find a 42T as long as the 44T is available and will shift well with my FD-CX70 top pull front mech. If all else fails, I will look at replacing my crank with one that has a future-proof supply of rings (e.g. Rene Herse) and may buy a spare ring in that case to avoid being in this situation again.

Joe

[satanas]

The Sugino OX series road cranks never officially had an outer ring smaller than 42T. However, there was a 156mm Q MTB double with the same BCDs for a while, the ZX801D. For this crankset you could have 42 or 40T outers, combined with 28, 26 or 24T inners. Soma/Merry Sales seemed to offer these rings as options on the OX series cranks they sold.

Unfortunately, both those cranks and the rings that fit them are long extinct; I was never able to find ZX cranks in the length I wanted anywhere in the world, and have doubts they existed. I suppose it's dimly possible someone in Japan many still have rings lurking about on a shelf, but good luck tracking them down. Larger TA 110 BCD middle rings seem very hard to find at present, like everything else; I've been looking for a 42 or 38T (preferably in silver) ex-Europe with no success...

Later,

Stephen

[Stephen Poole]

Oops - I meant to say smaller than 44T; 42T was ZX801D only.

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[Orc]

I must admit I am somewhat confused here;  why not get third party rings instead?   Is the additional half mm for the bolt head a showstopper?    (I run biopace alpine doubles [28/48] on most of my OX?01s and despite the rings being fairly stout never hear any interference except maybe when I'm perversely crosschaining little/little)

-david parsons

[joe...@gmail.com]

Checking my old Tokyo San-Esu catalog from a few years ago, I can confirm that no OX801D cranks were listed with rings smaller than 44-30. There was no 42 or 40 outer. I believe the same was true for the main Sugino website, when they still listed the OX801D. So already back then, Soma/Merry Sales was the only source I could find for the combination of cranks and sub-44 rings. Here in Japan I would have had to buy the cranks and the rings separately to get that low gearing.

Re: david parsons:  why not get third party rings instead?

I would be happy to do that if I knew what was OK to buy. Rings that  shift OK only with downtube shifters won't do it for me. I previously used a Spa Cycles touring triple with their own Zicral rings and was not happy with the shift quality with Shimano STI. I want to avoid issues with mounting the large ring on the inside of the crank, bolt lengths and sunk bolt holes, etc. or without ramps and pins for Shimano brifters or ramps and pins that are more decorative than functional.  

I would be very grateful for specific 42T recommendations that are known to work well with OX-601D/OX-801D and Shimano brifters, alternatively 44T rings. I suspect the CP110S-44T meant for the new OX2-901D would also work but don't know for sure.

Joe

[Orc]

On Wednesday, May 5, 2021 at 11:20:20 PM UTC-7 joe...@gmail.com wrote:

> Re: david parsons:  why not get third party rings instead?

> I would be happy to do that if I knew what was OK to buy. Rings that  shift OK only wit

> downtube shifters won't do it for me. I previously used a Spa Cycles touring triple with

> their own Zicral rings and was not happy with the shift quality with Shimano STI. I want

> to avoid issues with mounting the large ring on the inside of the crank, bolt lengths and

> sunk bolt holes, etc. or without ramps and pins for Shimano brifters or ramps and pins

> that are more decorative than functional. 

Brifters are all I use on my dangly bikes, and even the old Biopace rings I've got (no ramps

& pins) shift for me without fuss.   As for the sunken bolt holes, mine are hidden between

the spider and the ring;  the blind side of the chicago bolt sticks out a little bit further than

they would if they could snuggle into the recess, but not (in my experience) far enough to

foul the chain when it's riding on the alpine ring.   I'd like to say I can reuse the chainring

bolts that Sugino supplied, but I've such a collection of OX?01's that I don't remember

which ones came with their own chainring bolts or not.

Shimano's offerings in 110 bcd are fairly anemic once you get away from compact double

sizes, but Sram sells more large-ring-ramped rings in the mid to high 40s  (and, at least from

a brief look at the net of a billion lies, there are a fair number of ramped & pinned mtb rings in

5-hole 110bsd.

Proof, pudding-style, with a biopace 50 and an appropriately rotated |BLACK| 34:

-david parsons

[Michael Wong]

I tried several different chainrings on my Elephant. TA and Dimension both shifted fantastic. Vuelta and Origin8 were ok but not nearly as good.

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[Alex I]

I used a Spa Cycles 28 inner and a 44 ramped/pinned middle position ring on my 130/74 triple crank last year (previous thread on here about getting the middle instead of an outer as it sat on the inside of the spider, someone pointed that out to me and saved me some trouble). Shifted pretty good with Shimano 9s brifters and a CX-70 FD. Downshift of course was simple, but full disclosure: I'm in the habit of babying my upshifts a bit anyways as my other bike sports a similar 46/30 but with a flat 46 (135/74 triple), and I don't upshift the front under load the way I ride, so YMMV.

Alex in CO

[Michael Wong]

Joe, 

Suginos are quite nice but TA rings shift fantastic. I'm not sure anything shifts at all better, except maybe matched Dura-Ace or XTR rings. I'd bet Dimension shifts as well as Sugino also.

 

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[Michael Wong]

Peter white has Zephyrs. Dimension sells direct.

On Wed, May 5, 2021 at 11:20 PM joe...@gmail.com <joe...@gmail.com> wrote:

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[Stephen Poole]

Some TA rings might shift well, but by no means will all combinations do so. The worst front shifting I've ever had - by far - was with TA rings (47x35x24T, marked "9/10 speed") on a TA Carmina crankset, and I tried at least 5 different FDs, from Shimano, Suntour and Campagnolo. FWIW, I was a pro mechanic for ~30 years but this combo just didn't want to work. Ancient (but matched) 7 speed Shimano Exage 46x36x26 rings behaved infinitely better, both sets used with a 10 speed chain.

With doubles and pinned and ramped rings, how well the shifting aids line up matters. If you use rings from a matched set, good shifting is certain, but if something else is substituted results can vary from excellent to marginal. Someone mentioned Shimano CX 46x36 rings, and with *some* Shimano sets (i.e., 4 bolt 6800) a 34T from a 50x34T pair can be happily swapped in, however randomly chosen 46x34 combos may or may not shift well, despite the presence of shifting aids on the outer ring. The "number of speeds" matters much less than correct rotational alignment IME, and flat rings can be more tolerant than fancier ones, though won't shift as well under load (or as rapidly) - not that you need to be able to do that.

The most important thing here is that if you're using anything other than a matched set of pinned and ramped rings YMMV - drastically!!!

Setup will matter too, but some combos just aren't going to shift acceptably unless your standards are low and your tolerance is high.

Caveat emptor,

Stephen

[joe...@gmail.com]

Thanks for all the information!

I have ordered a Spécialités TA Zephyr 110 BCD Middle ring to replace my Sugino 42T ring. I found both 40T and 42T available from various sources.

I also visited the Dimension website. They have 34, 36 and 38T available in ramped and pinned ("multispeed") 110 BCD middle, but not 40 or 42T.

I'll let you know how it works out once I've had a chance to ride it a bit!

Joe

 

[Eric M Cardella]

Joe,  

From what source did you end up buying the T.A. rings?

Eric

On May 7, 2021, at 1:05 AM, joe...@gmail.com <joe...@gmail.com> wrote:

Thanks for all the information!

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[Alex Wetmore]

I'm not Joe, but I've bought TA rings from Peter White Cycles, eBay, and European stores.

I'm using a TA 42t ring on OX601D cranks and it works great.  I use downtube shifters though and not brifters.  The shifting is very smooth and I expect brifters would work well.

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From: 65...@googlegroups.com <65...@googlegroups.com> on behalf of Eric M Cardella <ecar...@gmail.com>
Sent: Friday, May 7, 2021 7:22 AM
To: joe...@gmail.com <joe...@gmail.com>
Cc: 650b <65...@googlegroups.com>

Subject: Re: [650B] Sugino OX601D replacement chainrings

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[Michael Wong]

As Stephen says lining up the teeth can play a role. I've had a great outer chainring have the pin grab right on the center of the chain's bushing which was the worst possible spot. Not sure any chainring works then.

But some rings, won't shift well no matter what the alignment. The last Vuelta I tried a few years ago had such minimalist pins that they simply could not get purchase on the chain links.

Though as I think about it, Shimano's older MTB rings, with the huge sculpted pickups (can't really call them pins), would basically grab any chain anywhere and haul it up.

It's hard enough finding the proper rings when doing a custom config, especially if color is a consideration, so I rarely consider matching of chainring models in my selection and it can come back to bite. I've found TA have shifted amongst the best. I hope they work well for you!

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[Michael Wong]

Another consideration is chains. I have an older 30tx94mm Cannondale chainring that shifts only so-so (pinned 30t were a bit hard to find).

I found that it would only shift a KMC chain, which had a very thin inner link bevel and allowed even my skimpy pin the grab it on a chainring upshift

[Michael Wong]

PPS If anyone is interested I just found a good price on rare, affordable 58mm x 26t chainring:

https://www.mountainbikecomponents.co.uk/product/58bcd-5-arm-inner-9-10-speed-triple/

Ok I'll stop now XD

[Craig Drown]

Here’s a good source for TA rings.
https://www.bike-components.de/en/components/drivetrain/chainrings/?m66012filterManufacturer=TA
I run both 10 and 11 speed rings with 11 speed chain and cassette and can’t tell the difference.
Cheers,
Craig

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[joe...@gmail.com]

On Friday, 7 May 2021 at 23:22:54 UTC+9 ecar...@gmail.com wrote:

Joe,  

From what source did you end up buying the T.A. rings?

Eric,

After some reflection I had decided to change from 42/26 to 40/24 as those darn hills are getting steeper every year, I don't know why ;)

Wiggle in the UK had the 40T TA Zephyr in stock while a local source here in Tokyo had only the 42T. It's supposed to arrive here next week assuming nothing bad happens in the Suez...

I also ordered a new cassette. So now I just have to find myself a 74 BCD 24T as the inner and hope the shifting will work OK for that particular tooth combination. With the Sugino the front up-shifting was just OK: never super quick but it always succeeds. It just takes its part of a crank rotation and is in no hurry. As long as the TA Zephyr does at least as well I'll be happy!

I'll probably start riding the new rings in June.

 

Joe

[joe...@gmail.com]

I had promised to post results from my Sugino compact plus rings to TA Zephyr rings upgrade. 

Front shifting is absolutely perfect. It's right up there with the best Shimano setups I have ever used. That's with Ultegra 11 speed hydraulic brake brifters.

To recap, I had 42T/26T rings on my Sugino OX601D compact plus (110 BCD / 74 BCD) crank that I was running as 11-speed with STI and these were getting worn out. Sugino no longer makes those rings as they were designed for use with their discontinued ZX801D crank, even though Merry Sales also sold them with the OX601D / OX801D. The big ring is actually a middle, as it's also mounted on the inside of the spider. It has ramps and pins. The small ring doesn't need ramps and pins.

Shifting on the Sugino compact plus rings had been OK but not great. I never had any dropped chain on shifts, but the shift took some time even if I eased off during the shift.

When I replaced the Sugino rings with Specialites TA Zephyr rings I went two teeth smaller i.e. 40T/24T from 42T/26T. I could have stayed with the previous ring sizes but none of us are getting any younger and there have been more and more climbs over the past year or two that I had been walking parts of. 

I bought a new set of crank bolts (Sugino part #803 for 110/74 BCD, i.e. for inners smaller than 33T) so I didn't have to worry about reusing old bolts that had been sealed with some plastic goo to prevent them from loosening. Undoing the old bolts was the hardest part of the upgrade.

I love these TA Zephyr rings!

Joe

[Kevin]

Does anyone have a source for the TA Zephyr rings? I can't seem to find the middle rings in black.

[Kevin]

sorry, 46T in black. I can find the smaller ones.

[Huston]

Kevin,

Check out Peter White Cycles: https://www.peterwhitecycles.com/tach.php#zephyr. 

Huston

[Kevin]

Thank you, Huston. I had checked with PW and while they have the 46T middle, they only have it in silver.

[Kevin]

Anybody have luck using TA Zelito inner chainrings? Looking to go below 30T (idealy 26) with a 40T middle Zephyr as the outer ring.

[Michael Wong]

What front derailleur are you using for your 40/24?

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[Michael Wong]

Can the Sugino crank be shimmed to adjust the chainline?

On Wednesday, April 12, 2023, Huston <husto...@gmail.com> wrote:

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[Kevin]

Haven't grabbed a derailleur quite yet. I want to make sure I can use the inner TA chainring before I commit. If not, I'll look at other cranksets.

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[Michael Wong]

I was thinking theoretically, it seems like you'd need a GRX, to get that wide spread, but it seems like there are other 16T FDs.

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[Will Boericke]

I'm shifting 26/46 with a 9s Dura Ace FD, no problem.

Will

[Kevin]

I think that the GRX derailleur may be too far outboard for the OX601D as it has a 47mm chain line whereas the 601D has a 43.5mm chain line. Might not be able to adjust it inboard enough to work properly.

[Michael Wong]

True, but I meant an 11 sp grx

I believe that’s an 45mm chain line 

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[Stephen Poole]

TL;DR it can be done, but might require some tweaking, depending on the frame geometry, other parts, etc.

All GRX v2x cranksets have the same chainline (47mm according to the Shimano spec PDF), whether 11 or 12 speed. The 12 speed road cranks are alleged to have closer chainring spacing than 11 (though I've not seen a measurement), and presumably GRX are similar; the GRX crankarms haven't changed and are the same for 11 & 12.

Sugino sell shims to adjust the chainline for their 24mm spindle cranks but suggest not using more than 1.5mm, or the LH crank may not have sufficient engagement with the spindle.

As for Shimano road FD capacity, all the decent ones are rated for 16T; GRX 8xx FDs are rated for 17T, but in practice all the quoted compatible sizes and capacities are flexible - at the rear too.

With 40x26 rings the biggest problem will be getting the FD cage close enough to the outer ring without the tail of the cage fouling the chainstay. Usually ~42T is the limit, but this depends on STA, BB drop and chainstay length; another critical measurement is the angle between the seat tube and chainstay, and IME it's best to keep this within Shimano specs. If not, there can be problems with the chain hitting the inside top of the cage, which makes lots of noise, and can reduce the number of usable gears. There are widgets to lower the FD or adjust the angle - potentially handy if the frame has a braze-on mount.

FWIW, Sugino used to sell 42/40x28/26/24 rings for their long discontinued ZX801D MTB cranks, so there's no inherent problem with the rings fitting. MTBs however typically have less BB drop and/or a steeper STA, so the FD cage is much less likely to foul anything. The cages are shorter too, so may be a good option if you're not running STI; if you are there might not be enough cable pull for a mountain FD.

Also, FWIW, Dixna in Japan offer what I presume are matched sets of rings in unusual sizes (down to 34x24), although the chain drop pins don't line up with Sugino OX cranks; you may or may not care about this.

Later,

Stephen

[satanas]

PS: Re FDs, Shimano road FDs up to 11 are intended for a 43.5mm chainline, and 44.5mm for 12, but 47mm for GRX. Depending on the eventual chainline (after any shimming) of the OX cranks, either the road and/or GRX FDs might work. MTB FDs will expect a wider chainline, which may or msy not complicste using them. Also, FWIW, I had a Dura-Ace 740x FD working on a MTB with 42x29 rings, so the listed specs aren't necessarily hard and fast rules.

[Kevin]

TBH I might just go with a cues 40x26 crankset even thought I hate that it doesn't appear the chainrings are independently replaceable. They have a Cues FD that will presumably work without knocking into the chainstay. This is for a utility bike so I don't want to futz too much with shims and such.

[Stephen Poole]

On Sun, 26 Jan 2025, 14:19 Kevin, <klav...@gmail.com> wrote:

TBH I might just go with a cues 40x26 crankset even thought I hate that it doesn't appear the chainrings are independently replaceable. They have a Cues FD that will presumably work without knocking into the chainstay. This is for a utility bike so I don't want to futz too much with shims and such.

^ The horror, the horror.  :-(

The CUES cranks have a Q factor of either 178 or 180mm depending on the model - versus 145mm for OX - come in few lengths, don't IIRC have replaceable chainrings, plus they weigh a ton(ne). If it was me I'd much rather use a lower Q (not CUES!) crank and 1x for JRA, and I'm not a 1x fan.

Bear in mind also that CUES is intended for flat bar hybrids and MTBs; the frame geometry may not help FD clearance. I'd check the Shimano documentation carefully before going there.

Later,

Stephen

[Kevin]

I hadn't checked out the Q factor of Cues quite yet or the weight. I'll need to do some more poking around. I suppose I could use a bigger range rear cassette and run 42x28 chainrings to get the bottom end I need. This bike has a front cargo platform so sometimes I carry 30-40lbs of crap on it up and down hills. Trying to balance low end while loaded and top end while unloaded.

[Stephen Poole]

The OP hasn't yet said what the rest of the drivetrain is, but the recent Shimano 11 speed long cage road RDs will usually work with up to 11-40 cassettes, or up to 42 with GRX. The older ones (5800GS and 6800GS) are okay with 36T. The 9 speed MTB RDs are compatible with up to 10 speed road levers, and should be okay with at least 34T, maybe 36T.

FWIW, the FD doesn't necessarily have to be super close to the outer ring, but closer should shift a bit better. My last (stolen) gravel frame had a 72° STA, 435mm chainstays and 75mm BB drop, which gave a bit too tight an angle between the seat tube and chainstay. With 42x27 rings, I had to set the Ultegra R8000 FD about 3mm above the outer to clear the chainstay. Shifting was fine, but necause of that less-than-ideal angle the chain made a lot of noise on the inside of the cage, and meant I couldn't really use one or two of the cogs on the outer ring I would otherwise have used.

If you can find any, both the CX70 and Tiagra 4600 FDs (both 10 speed) have somewhat shorter cages thsn most.

Unless you're determined to keep the front gap to 14T, there's no reason why you can't have <28T with a slightly larger than 40T outer, for instance Dixna's touring chainrings are 43x27/25.

With CUES though you can run 36x22 rings with an 11-45 cassette, giving a lower gear than even I think is likely to be useful...

Later,

Stephen

[joe...@gmail.com]

I use the Shimano CX70 top-pull 10-speed FD with the TA Zephyr 40/24 rings. That's because my Elephant National Forest Explorer is set up cyclocross style, with the shifter cable running on top of the top tube instead of along the down tube. The fact that it's a 10 speed FD doesn't cause any issues. 

I believe basically any 10 or 11 speed road FS (bottom or top pull) should work for the 16T tooth gap, the same as with the popular 50/34 compact cranks. You want the clamp-on mounting so you can lower it close enough to the smaller ring.

Joe

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[Kevin]

Relatively steep STA on this particular frame with a 40mm BB drop. 

Right now it is a 1x9 with wildly high gearing (42 and 11x32) for what it is. I am planning on running 2x10 if smaller chainrings are used or 2x11 if larger ones as I should be able to get an 11-40 cassette on this wheel.

[Stephen Poole]

That 69° STA isn't going to help with FD clearance. It might be worth investigating 1x11 or 1x12 and avoiding a FD entirely. If the cassette starts with 11T (not 9 or 10T) it will fit on an 8/9/10 speed freehub body. You can get 11-45 or 11-50x11 in CUES, or 11-50/51/52 in 12 speed from various people - 50T from SRAM or Sunrace (SRAM spacing compatible), 51 from Sunrace (Shimano spacing compatible), or 52T from Garbaruk (lightweight, expensive) or Aliexpress. If you chose the chainring to give the highest significantly usable gear, chances are the low gear would be adequate, or at least much better than it is now.

Later,

Stephen

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[Kevin]

Great point. When looking at drivetrains I hadn't thought about tubing angles getting in the way of derailleur mounting. I might do a mock up with the Gevenalle Burd FD that I have lying around just to see what spacing would be like.

Thanks all