rear caliper with best clearance?

[doc]

Hi all,

First time poster here.

I found a sweet Paul Taylor True Temper S3 frame and just finished swapping all my parts from my BMC onto it (Campy SR 11, Zipp 404, Enve 1.0 fork etc). I installed the calipers last, only to find that the top of the 25c Conti 4000 tire contacts the underside of the caliper. Additionally, the brake blocks are as high as they can go in the caliper arms and I still need a bit more room to get the pads to properly seat on the aluminum brake wall. The rear is a single pivot SR Skeleton style caliper. There is about 8mm of clearance at least to the brake bridge and more than ample clearance to the seat tube and between the chainstays. it just seems the brake bridge low enough to put the caliper out of its useable range. Zero issues with front, as you'd imagine.

I've also tested Vittoria Corsa 25c tires and Campy Daytona dual pivot rear (pre-skeleton) and still too tight.

Are there other caliper options with known better clearance?

Thanks!

[weisan]

Originally Posted by doc

Are there other caliper options with known better clearance?

Thanks!

http://blackmtncycles.com/clearance-pt-ii-road-frames/

From another fellow P.T.

Mine was designed for 35mm tires.

[jdp211]

If I had to guess (given the build kit described) that the OP is referring to having a BMC, not a Black Mountain Cycles.

As to the parts in question, ultegra 6800 or 8000 brakes are probably your best bet for a short reach caliper.

[jtbadge]

My Merckx MX Leader has a super low rear brake bridge. Compared to 11s Shimano Ultegra 6800 and 105 5800 calipers, the black single pivot Record skeleton caliper I ran last fall had by far the best vertical clearance. Never tried a Campy dual pivot on the rear, but looking at this photo, you might get a little extra clearance (single pivot left, dual pivot right)

[doc]

Thanks for the replies.

Yes, donor bike was a BMC pro machine. The Taylor is likely an early 2000s frame. Why is the brake bridge so low? arg!

BTW, nice PT above.

Here are pics of clearance from rear and front (brake bridge seems ok with 25c tire, but tire touches caliper top).

Would a Zero G rear caliper work? Seems like they are spaced farther from the frame than Record single pivot and that maybe there is more clearance under bolt?

Can't wait to ride this rig, so help appreciated for sure (please forgive the too-high post in pic).

[jtbadge]

You could also try adding another washer or two between the caliper and the frame. This could put the caliper a little bit further from the apex of the tire.

[doc]

Originally Posted by jtbadge

You could also try adding another washer or two between the caliper and the frame. This could put the caliper a little bit further from the apex of the tire.

i agree, but with my current caliper I don't think that would get me enough clearance to not worry about the tire rubbing when expanded at speed or stones etc. getting caught in there.

i don't want to admit defeat and run 23c tires quite yet...

There is also the issue of not being able to get the brake blocks high enough in the caliper to sit on the rims properly, which is really weird. I could file the openings a bit, but why such an extreme? maybe that is why the frame was for sale in the first place?

[dave thompson]

I ran Conti 25s on wide HED rims on my Taylor without issue using Shimano 6800 calipers.

Perhaps you can ‘borrow’ a caliper set from a friend to see if it might work on your Taylor.

[doc]

Originally Posted by dave thompson

I ran Conti 25s on wide HED rims on my Taylor without issue using Shimano 6800 calipers.

Perhaps you can ‘borrow’ a caliper set from a friend to see if it might work on your Taylor.

planning to do this exactly at my LBS.

any idea how much tire height changes when swapping a 25c tire from a standard width rim (pre firecrest zipp 404, ~17mm inner rim) to a current wide rim (for example HED with ~20-21mm inner rim)?

[PNW]

I too am wondering. If I want to roll a wider carbon rim...will Boras/Vittoria Corsa G’s clear? Currently these are Corsa G’s mounted to Shamal Ultra C17’s.

This Moots CR frame/fork can clear 28s but since the SR calipers/dual pivot don’t clear as much...I don’t think it’d work?










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[ultraman6970]

The rim has a lot to do with the fit and I cant talk about wide clincher rims... but what i've noticed in the wheel I built with the HED C2 tubular rim is that the fit of the tubular in the rim is lower, actually using any other rim a 27 mm tubular barely touched the caliper, with the HED C2 I got maybe 3-4 mm clearance now.

I do not know in clincher but in tubular too, you can find differences in the rims up to like 2 mm in the diameter between brands and models. so that makes a big difference at the time to get the clearance needed.

[PNW]

Would EE brakes give more clearance than a SR caliper?


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[darkmother]

Not sure which caliper has the best clearance, but Dura Ace 7900 have lots more than the pre-skeleton Chorus single pivot rear that I had on my bike previously. I can run 28's with the DA caliper, but maybe 25-26 with the Chorus.

Hope you can get it sorted, good luck.

[doc]

[QUOTE=PNW;2416158]I too am wondering. If I want to roll a wider carbon rim...will Boras/Vittoria Corsa G’s clear? Currently these are Corsa G’s mounted to Shamal Ultra C17’s.

This Moots CR frame/fork can clear 28s but since the SR calipers/dual pivot don’t clear as much...I don’t think it’d work?



I wish I was working with that much clearance!

I think shifting your 28c tires to a wider inner profile rim, such as a 20-21mm, (given my current readings) will lower the overall height of the tire a bit...but not much. It will also improve your contact patch, give the tire a better overall profile and allow you to run lower pressures if desired.

my problem with the Record caliper is not side to side, but overall height clearance.

[doc]

Originally Posted by darkmother

Not sure which caliper has the best clearance, but Dura Ace 7900 have lots more than the pre-skeleton Chorus single pivot rear that I had on my bike previously. I can run 28's with the DA caliper, but maybe 25-26 with the Chorus.

Hope you can get it sorted, good luck.

thanks. a friend is sending me some 7800 to try. we'll see.