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Thanks Mark and David, and Philip, I'm excited to hear what you find!I'm 6'3 and 205lbs, so I end up running 40psi front / 45psi rear on 42mm tires. I know lighter folks are able to run with those pressures on 38mm or even 35mm tires!I'm hoping that if I can scale up the tires to match my largeness I can get both tires sub-40psi, and I'd really rather stick with rim brakes.Reed
On Thu, Feb 16, 2017 at 7:37 AM, Philip Kim <phili...@gmail.com> wrote:
got norther custom coming in the next couple of weeks. fitted to have paul brazeons and i have a pair of SBH laying around. i'll try to put them on under fenders and let the list know.--
On Wednesday, February 15, 2017 at 8:08:43 PM UTC-5, Reed Kennedy wrote:Has anyone tried running the Compass Switchback Hill 650B x 48mm tires with centerpull brakes and fenders? How did the clearances work out? What brake did you use?The longest reach centerpull brakes I've been able to find give 75-80mm, and I'm not sure that's enough.Best,Reed
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Please let us know what Mike says.
Philip, thanks for all this good information.
--Mitch
--
FYI: I just tried to put a front Switchback Hill on my Rambler with MAFAC Raids and VO Zeppelin fenders. Since I had optimized the fender placement for Hetres, the Switchbacks rubbed slightly on the underside of the fenders, but I'm pretty sure it would be no problem if I refit the fenders to sit a few mm higher. Brake clearance wouldn't be an issue.Ryan
So Mitch is it fair to say that it is your frame and fork that don't allow SBH -- nothing to do with the Raid brakes?--
-Mark
Mitch wrote:My Boulder with brazed Raids and 62mm Honjos has lots of clearance over BSP ELs that are about 40mm actual on A23s. 48mm Switch Back Hills wouldn't fit but only because the fenders are mildly crimped at crown, seatstay, chainstay, taking the side-to-side space a 48 would need.
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Later,
Stephen
--Mitch
So it looks like SBHs are doable with some sort of fenders plus Raids or Compass brakes. Paul Racers use different boss spacing, bulkier springs/pivots and the reach might be a bit less too IIRC(?).
One wonders what would happen with TBs or similar tyres with corner knobs. I presume fenders are no go, but wonder if the tyres would foul the calipers.
Perhaps it might be worth reviving rollercams or U brakes for these sorts of bikes? Or just stick with cantis...
Later,
Stephen
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Patch,John at Fitz Cycles is currently building me a frame for 48mm SBH tires with Compass 62mm smooth 650B fenders and Compass centerpull brakes.Here's the full build list:https://docs.google.com/spreadsheets/d/1AptZ3zU-q8Cd6VS-jhuolTxNJPjo6AmjH4NVoIQCphI/edit?usp=sharingIt should be done in the next month or so. Will share more when I know more!Best,Reed
On Thu, Jul 6, 2017 at 10:49 AM, Patch T <ptro...@gmail.com> wrote:
--Hey All,Bringing this up again.Has anyone had any further experience or additional insight with this configuration? Fenders?I am in queue with Bantam and am leaning towards a tire width range of 42-48mm. While cantilevers seem to remain the best choice for rim brakes, I'm still curious. Especially considering I can choose where the posts go...ThanksPatch
On Wednesday, February 15, 2017 at 5:08:43 PM UTC-8, Reed Kennedy wrote:Has anyone tried running the Compass Switchback Hill 650B x 48mm tires with centerpull brakes and fenders? How did the clearances work out? What brake did you use?The longest reach centerpull brakes I've been able to find give 75-80mm, and I'm not sure that's enough.Best,Reed
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Cantilevers will definitely work. Centrepulls may be able to be made to work, but will end up near maximum reach, thus lowering brake MA; clearance may or may not be adequate, depending on one's viewpoint.
Cantis are the safe solution here, and can provide both much more clearance and more powerful brakes. Lots of people seem to detest cantis for various reasons though, but maybe once the Compass cantis become available this resistance will magically decline, since the branding and higher cost may legitimise them.
IMHO, cantis or discs are the sensible choices here - assuming performance is what counts - but speccing bikes has at least as much to do with religious levels of fanaticism about retro aestetics and anti-modernism as anything else. :-(
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Yes, it will be an awesome bike. I'm having the same bike built, but by Bob at Bantam who said the combination of centerpulls (Compass or Paul) and 48s with fenders could not be done. Cantis for me...Goes to show the builder sure matters.
On Thursday, July 6, 2017 at 3:32:51 PM UTC-4, Reed Kennedy wrote:
Patch,John at Fitz Cycles is currently building me a frame for 48mm SBH tires with Compass 62mm smooth 650B fenders and Compass centerpull brakes.Here's the full build list:https://docs.google.com/spreadsheets/d/1AptZ3zU-q8Cd6VS-jhuolTxNJPjo6AmjH4NVoIQCphI/edit?usp=sharingIt should be done in the next month or so. Will share more when I know more!Best,Reed
On Thu, Jul 6, 2017 at 10:49 AM, Patch T <ptro...@gmail.com> wrote:
--Hey All,Bringing this up again.Has anyone had any further experience or additional insight with this configuration? Fenders?I am in queue with Bantam and am leaning towards a tire width range of 42-48mm. While cantilevers seem to remain the best choice for rim brakes, I'm still curious. Especially considering I can choose where the posts go...ThanksPatch
On Wednesday, February 15, 2017 at 5:08:43 PM UTC-8, Reed Kennedy wrote:Has anyone tried running the Compass Switchback Hill 650B x 48mm tires with centerpull brakes and fenders? How did the clearances work out? What brake did you use?The longest reach centerpull brakes I've been able to find give 75-80mm, and I'm not sure that's enough.Best,Reed
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Reed, thanks for sharing. I look forward to seeing and hearing about this build.
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Hi Reed,
A couple of months or weeks ago, I took out a pair of MAFAC RAID centerpulls that I had and went to this website https://ruedatropical.wordpress.com/2009/01/11/mafac-dia-compe-paul-centerpull-brake-specs/, to compare measurements. Anyway, your question is not the first time it has been brought up so what I did was measure the width of the post of my centerpulls, compared them to the website measures and determine that the side widths are adequate for 48mm. Jan Heine centerpulls are modeled after MAFAC RAID Centerpulls and has stated on his website that the original design for the brakes were for optimized for 42mm balloon tires but he recommends as a caution to have 6mm of clearance. The only issue I could not determine was if a fender was added to the bicycle, can the 6 mm clearance be had as well. That is why I said, talk to the builder because it may be an issue. Although, I have seen one person with centerpull brakes with SBH tires but his clearance was very tight with fenders.
On Fri, Jul 7, 2017 at 5:28 PM, Reed Kennedy <re...@notfine.com> wrote:
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Maybe 6mm of lateral clearance between the brake arm and tyre was what was meant? IMHO that should be enough, very sticky mud excepted.
Also, FWIW, though I wouldn't want to have anywhere near as little as 6mm between the fender and tyre with wide tyres and possible dirt road use, with narrow high pressure tyres, for road use *only* very tight clearance can be fine. I think I had ~4-5mm on the Allez back in 1991 with no issues; no darumas though.
Re centrepulls versus cantis: I actually much prefer the feel of dual-pivot sidepulls (or hydraulic discs), but cantis do the job and rarely feel weird or spongy. My experiences with centrepulls have been either zero mechanical advantage (Mafac or Universal with stock levers), or totally spongy (everything else). Cantis rarely feel amazing - though the ones on my Tony Oliver audax are close - but have always done the job for me.
My 650b Plan A was to use cantis and a Pacenti MTB crown, allowing tyres up to at least 60mm width - not possible with centrepulls unless one counts U brakes. Plan B is now Shimano hydros (if the bits ever become available), and a lighter frame and fork with room for 54mm max.
Later,
Stephen
--
Hey Lee, good information, thanks! I'll admit that I didn't do much research on this myself. I asked three builders I respect and two said they could do it, so I assumed it was possible (if difficult) based on their word. (For the record, the third builder never got back to me.)Could you explain a little further what you mean by "clearance between the post but above for the fender"? I can't quite picture it. Do you mean the centerpull braze-on posts? Do you fear there won't be clearance at the top of the tire? Or at the sides?Best,Reed
On Thu, Jul 6, 2017 at 8:33 PM, Lee Legrand <krm...@gmail.com> wrote:
Good LuckHi Reed,That will be a sweet bicycle when it is all done. Be sure to post pics. Not sure about the 48mm tires and centerpull brakes. What I did read on BQ blog is that you should have 6mm clearance around tire. I did calculations some time back and you exceed the minimum clearance between the post but above for the fender, that could be an issue and a frame builder would know better if it is do able or not.
On Thu, Jul 6, 2017 at 11:12 PM, Stephen Poole <nsc.e...@gmail.com> wrote:
Cantilevers will definitely work. Centrepulls may be able to be made to work, but will end up near maximum reach, thus lowering brake MA; clearance may or may not be adequate, depending on one's viewpoint.
Cantis are the safe solution here, and can provide both much more clearance and more powerful brakes. Lots of people seem to detest cantis for various reasons though, but maybe once the Compass cantis become available this resistance will magically decline, since the branding and higher cost may legitimise them.
IMHO, cantis or discs are the sensible choices here - assuming performance is what counts - but speccing bikes has at least as much to do with religious levels of fanaticism about retro aestetics and anti-modernism as anything else. :-(
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Nope - carbon, so lighter. Won't flex as much as steel but with ~48mm tyres this shouldn't be a problem. Discs also allow lighter rims and seatstays, so on balance it should work out better. If the fork ends up being too stiff for comfort, one of these might fix that:
https://redshiftsports.com/shockstop-suspension-stem
It's all trade-offs, and in my case the logistics are simpler for a Ti frame than for steel; it's complicated.
Lots of people seem to detest cantis for various reasons though, but maybe once the Compass cantis become available this resistance will magically decline, since the branding and higher cost may legitimise them.IMHO, cantis or discs are the sensible choices here - assuming performance is what counts - but speccing bikes has at least as much to do with religious levels of fanaticism about retro aestetics and anti-modernism as anything else. :-(
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Thanks for pointing this out. I'm waiting for the compass V-brakes, myself. Maybe then my buddies will finally appreciate my use of these excellent brakes instead of thinking that I'm cheap and ignorant.
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I have no problem with any kind of brakes, do not know where Peter is getting his information about Compass producing V-brakes in the future.
On Tue, Jul 18, 2017 at 11:29 AM, Lee Legrand <krm...@gmail.com> wrote:
V-brakes?
On Tue, Jul 18, 2017 at 8:04 AM, Peter Turskovitch <patric...@gmail.com> wrote:
On Friday, July 7, 2017 at 5:12:51 AM UTC+2, satanas wrote:Lots of people seem to detest cantis for various reasons though, but maybe once the Compass cantis become available this resistance will magically decline, since the branding and higher cost may legitimise them.IMHO, cantis or discs are the sensible choices here - assuming performance is what counts - but speccing bikes has at least as much to do with religious levels of fanaticism about retro aestetics and anti-modernism as anything else. :-(
Thanks for pointing this out. I'm waiting for the compass V-brakes, myself. Maybe then my buddies will finally appreciate my use of these excellent brakes instead of thinking that I'm cheap and ignorant.
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No, he's just being sarcastic.