1x drivetrain question

[Lithocarpus]

I’m considering setting up my MIT Atlantis with a 1x system and was interested to know if anyone here has done this, what components you used, and if the chain stay length caused any complications. So far, I’m considering a 11x50 SunRace cassette, SRAM eagle GX derailleur, chain, and trigger shifter, but am hoping to use my existing Silver crankset. It’s a triple, but I think the middle chainring position would be aligned correctly. If that crank works, I’d likely throw a guard on it. Long term, I’m interested in a White Industries crankset, but that’s further down the road.

What are your experiences ?  Attached image of the current set up. 

[Drw]

I just finished a ride on my 1x kid hauling riv.  I used a IRD mjolnir crank, shimano bar end on paul thumbie, and sunrace 11-42 cassette. 9 speed, friction shifting. works great and i mostly pieced it together from stuff i already had, minus the crank. i dont remember if i did any calculations for chainline, but id assume that middle ring would be the right position. 

[Drw]

this is the very weird bike. 

[Deacon Patrick]

My Gus Boots Wilsen is 1x11, shimano whatever groupset, as built by Riv, playing with various set ups. Zero problems as far as I can tell with the long chain stays and the 1x. I still would prefer friction shifting, but that's me and my fixed gear preference talking. Grin. My tendency is to shift 2-4 gears at a go, so I ride it more like a wide-rage 5 speed.

With abandon,

Patrick

[Deacon Patrick]

One more note, the 1x seems touchy to snow and mud in the derailure, more so than I recall when my Hunqapillar was 2x9 speed. This could be do to any combination of: 1. not remembering well, 2. 1x11's in general due to tight tolerances or, 3. longer chain stays.

With abandon,

Patrick 

[tarik saleh]

Drew,  

That is an excellent bike. 

Tarik

Sent from the Space Egg

Tarik Saleh Bike Club:

tariksaleh.com/tsbc 

On Mar 22, 2020, at 12:04 PM, Drw <drewbe...@gmail.com> wrote:



this is the very weird bike. 

<IMG_2875.jpg>

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<IMG_2875.jpg>

[Joe Bernard]

I built a MIT Atlantis with a Microshift Advent 1 x 11-42 group, normal chainring and a Paul Chainkeeper. Easy peasy, works great.

[kim young]

For whatever this is worth, I agree -patrick -all my 1xs are so fussy. (But i live in a remote mountainous area and I am never on road. It’s more like mini repack terrain. So this info might not apply to this forum so much).

I got chain drop whenever it was slightly muddy. The chain guide mitigated that problem. But I still have the notorious back-pedal issues. For me it has to do with the big pizza ring (50t). Back-pedal has not been a problem with the 46. 50t when it’s working means I can climb almost anything. But I have the notorious  back-pedal issues -it has to do with the big pizza ring (50t). Back-pedal has not been a problem with the 46.

I’ve done b-tension w the special tool. Tried new chains, etc. but still no dice.

Box one has an 8spd/50t coming out and I admit I am kinda tempted.But I will wait for the reviews.

Maybe there’s something I’m missing but I am going back to 2x w. my next build. Much less drama for me.

I need to talk to The Analog team about their buzzard gearing. 

(And Thx to everyone btw for the edification.)

kim in az 

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[Deacon Patrick]

Aye, Kim. My 1x11 works well enough that I plan to ride it into the ground then go with 2x9ish with stick front derailure. I think my 11 bottoms out at 46t, and, yeah, I can climb nearly anything.

With abandon,

Patrick 

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[kim young]

What’s a stick derailleur?

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[Deacon Patrick]

Using your fingers or a stick to shift, effectively making it 2 1x systems on the same bike. Allows for use of wide/narrow chain rings and works really well in my experience. Takes 3 seconds at a stop I'm stopping at anyway, usually at the trailhead or an obvious shift in terrain. Why? Simplicity. No trimming, no wrenching a derailure cause it ain't there. Grin.

With abandon,

Patrick

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[kim young]

:)

 I love that.

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[Deacon Patrick]

Technology I stole from Grant. Grin.

With abandon,

Patrick

:)

 I love that.

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[Ian Dickson]

Do you remember what spindle length you're running with the Mjolnir? I couldn't find any info about that.

[Michael Morrissey]

Running a “one-by” setup is so easy. I wouldn’t have my bikes any other way. I would recommend a changing guard like the one Rivendell sells in the outer ring position if you are running a regular chainring. The alternative is a skip tooth narrow wide chainring like one from WolfTooth. I have a WolfTooth on my Rivendell as a 1x9.

Also keep in mind Sheldon Brown’s advice about his three speed. He said to set up your gear ratios as regular, slower, and really slow. So, go low with a chainring size. If memory serves, 34 teeth is a nice and slow way to go.

Good luck!

[Drw]

I don’t remember...sorry

[Christopher Cote]

I have two bikes set up with 1x11 drivetrains. They're both off-road specific rigs.

The first is a Surly Krampus with a Shimano SLX drivetrain. 11-46 cassette and a 26t Wolftooth narrow-wide chainring. It works flawlessly. I like not having to think about front shifting. The gear range may seem low, but this bike has 29x3" wheels, which are around 31" in diameter, so that raises the gearing quite a bit. I greared it down so I can spin up the steepest climbs. I do run out of higher gears on the rare occasions that I hit the pavement. Also, the gaps between the lowest few gears is quite large.

The other bike is a Surly Ice Cream Truck fat bike with 26x5" tires. I'm running an 11-50 Sunrace cassette with the same SLX derailleur and shifter as the Krampus. I have to use a Wolftooth "GoatLink" to drop the derailleur down to clear the 50 tooth cog. This combo shifts OK when everything is tuned perfectly. One click either way on the derailleur cable adjuster, or a 1/8 turn on the B-tension screw, and it won't shift properly. The large gaps between the lowest few gears is obviously worse than on the 11-46 equipped Krampus.

If I build another 1x bike, it will probably use Shimano 12-speed with a 10-51 cassette. I am not a fan of SRAM, so I will avoid it at all cost.

For an all-rounder, I think a double or triple crankset is still the best way to get a good gear spread and reasonable jumps between gears.

Chris

[tc]

My research turned up these suggestions to help chain on and 'ensmoothen' your shifting, esp. if you'll be going over bumpy terrain:

• Use a narrow-wide chain ring; the teeth profile grabs at the chain better than a traditional ring's teeth.  (Or, use a chain guide ... but you might not like the looks of it...and it kinda negates the clean look of not having a FD anyway.)
• Use a clutch rear derailleur to help keep tension on the chain at all times.

Tom

On Sunday, March 22, 2020 at 12:15:58 PM UTC-4, Lithocarpus wrote:

[Fryfam]

+1 on the recommendation for a narrow wide chainring.

I have two 90s bikes with this config:

1) A Miyata mtb with a 4-bolt Wolf Tooth style narrow wide 32t chain ring (104mm), deore cranks, m591 Deore rd and 9-speed Dura Ace bar end shifter in friction mode

2) Paramount mtb with a 5-bolt Race Face narrow wide 40t chain ring (130mm), Ultegra 6500 cranks, xt trigger shifter and m771 xt rd

Both feature a 11-34t cassette. Shifting on both is crisp and smooth, but I prefer the 40t narrow wide for speed reasons.

https://www.bikecalc.com/gear_speed

Good luck!

On Sunday, March 22, 2020 at 9:15:58 AM UTC-7, Lithocarpus wrote:

[Conway Bennett]

Here is a 2x9 "stick shift" on my wife's Riv:

https://photos.app.goo.gl/7hXFZiE3MBSYvMY2A

[Conway Bennett]

[Nick Payne]

On Monday, 23 March 2020 03:15:58 UTC+11, Lithocarpus wrote:

I’m considering setting up my MIT Atlantis with a 1x system and was interested to know if anyone here has done this, what components you used, and if the chain stay length caused any complications. So far, I’m considering a 11x50 SunRace cassette, SRAM eagle GX derailleur, chain, and trigger shifter, but am hoping to use my existing Silver crankset. It’s a triple, but I think the middle chainring position would be aligned correctly. If that crank works, I’d likely throw a guard on it. Long term, I’m interested in a White Industries crankset, but that’s further down the road.

I have setup two 1x bikes for my wife, the most recent using that same Sunrace 11-50 cassette with SRAM AXS Eagle shifter, derailleur, and chain, SRAM GX Eagle 165mm cranks with a 36t narrow-wide chainring, some wheels and other stuff I already had, and I installed the components on a Carbonda CFR505 frame. She's an experienced cyclist, and likes the 1x setups and the electronic shifting. The SRAM Eagle chain was 126 links as supplied - I had quite a few links left over when I shortened it to install on the Carbonda, but don't know if 126 links would be enough for the Atlantis.

Nick

[Will Ashe]

I’m running near the same setup on my Clem. Vintage Deore cranks with stock Clem rings, GX Eagle RD, Eagle chain, Sunrace cassette, and Microshift 12spd barcon. I’ve had no issues whatsoever. It shifts perfectly in index mode, but friction is a little tricky.

[kim young]

Ughhhh . Swoon. I feel like Gollum up in here drooling over that rosco. what a perfect bike. 

On Sun, Mar 29, 2020 at 7:29 AM Conway Bennett <captaincon...@gmail.com> wrote:

Here is a 2x9 "stick shift" on my wife's Riv:

https://photos.app.goo.gl/7hXFZiE3MBSYvMY2A

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[Lithocarpus]

I just finished up installing the new 1x drivetrain today.  I took it out for a very short ride and love the gearing.  Here's what I went with: 

- SunRace 11-50 cassette

- SRAM GX derailleur and trigger shifter and chain

- Wolf Tooth 34t narrow / wide

- Kept the Silver crankset and installed the chainring in the middle position with a Silver chainguard (for looks, not function).  

This photo is with road tires.  I typically have this bike set up for mtn / off-road.  I'm going to switch out the tires tomorrow and take it out for a long fire road / trail ride.  Thanks for the input from everyone.  I ended up emailing with James at Analog to think through the whole set up and purchased most of this through his shop.  Next up: new cranks and wheels.   

[Nick Payne]

So the stock SRAM chain was long enough on the Atlantis without needing to add links?

Nick

[Lithocarpus]

I purchased a 120 link chain hoping that would be enough, but it was just a little shy. I ended up splicing two together for about 124 links in all.