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PostPosted: Tue Sep 27, 2011 2:45 pm 
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Joined: Sun Aug 23, 2009 10:38 am
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Anybody know if 32mm tires can fit in short-reach caliper brakes? I'm concerned that the tire height might be too high and touch the underside of the brake calipers.


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PostPosted: Tue Sep 27, 2011 7:52 pm 
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Joined: Fri Jan 13, 2006 6:01 pm
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I would say no. Likely to rub on the brake bridge/fork if a 32mm tyre used. Most calipers measure from the centre bolt to the lowest set point I think, so not a lot of room left as the range is usually 45-55mm.


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Posted: Tue Sep 27, 2011 7:52 pm 


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PostPosted: Tue Sep 27, 2011 8:22 pm 
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Joined: Mon Apr 19, 2010 10:33 pm
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Probably not, I can fit a 30mm tubular cross tire with a diamond tread, but barely. Keep in mind that tires are notoriously mismeasured. One factorys 32 may be anothers 28, so all you can do is try.

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PostPosted: Tue Sep 27, 2011 11:39 pm 
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28s were not even close to fitting in mine. They were true 28s however.


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PostPosted: Wed Sep 28, 2011 3:21 am 
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For fun I tried to put my touring bike's 35mm Specialized tire front wheel on one of my road bikes. Road bike has 1998 Chorus short reach calipers. The 35 tire completely filled up the caliper. Touching on the top and sides. I had to deflate the tire to get it between the brake pads. I did not inflate the tire when it was in the caliper. It filled the space with no air in the tire. No way the wheel could turn. This was a 35 heavy duty touring tire. A shorter 32 with light tread would be smaller of course. But I'm pretty sure it would not be smaller enough to work.

I have 28 Grand Prix 4 Season tires that easily fit under short reach side pull calipers. But they actually only measure 26mm even though they are called 28.


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PostPosted: Wed Sep 28, 2011 3:12 pm 
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Ok, thanks guys, but what if I just want to put some smooth 32mm tires, not cross tires? I just want to do a little dirt road riding.


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PostPosted: Wed Sep 28, 2011 4:30 pm 
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Location: UK
I doubt 32s will fit. I've just had a look at my Aeron frame which is designed for mudguard clearance using standard calipers. It's fitted with chorus brakes. The blocks are virtually in the lowest portion of the cutouts giving nearly max clearance. I'd say 28mm would be the largest without mudguards fitted.

Have a look at your current frame and wheels. What tyres have you got fitted and how much clearance is there now?


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PostPosted: Wed Sep 28, 2011 7:47 pm 
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I tried 35mm (34mm true size) Conti Speedking in my Ultegra 6700 front brake which with my fork has the pads almost in the bottom position. With little air it just, just fitted but fully inflated it was stuck. I reckon 32mm true width would work, but the fork has the brake mounted fairly high...

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PostPosted: Sun Oct 02, 2011 6:45 am 
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Location: Lausanne, Switzerland
I agree with what others have said - 28mm is really the largest tire that will fit in standard road brakes, and even then only if your frame and fork also has the necessary clearance. However, some manufacturers are pretty generous with their stated measurements. I recently got some Continental Touring Plus 700x28 tires. They were a lot narrower than I was expecting, with the widest point being about 25-26mm. I regretted not getting the next size up, which is listed as 32mm, but is probably 28-30mm. They might fit, but you cannot be sure until you try.


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PostPosted: Fri Aug 01, 2014 5:20 am 
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Joined: Sun Jun 15, 2008 4:57 am
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Location: Irvine, CA
bones wrote:
Anybody know if 32mm tires can fit in short-reach caliper brakes? I'm concerned that the tire height might be too high and touch the underside of the brake calipers.


Some of the newer calipers have more clearance but we've opted for long reach calipers on the new F1 PR so 32mm CX tires have ample clearance for gravel/dirt/cobbled road rides. The bike comes with 27mm Challenge Paris-Roubaix 300tpi cotton 27mm clinchers.

https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-xfa1/t1.0-9/p417x417/10513376_10204363550554855_4185109871969026207_n.jpg

https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-xap1/v/t1.0-9/1551759_10204363552914914_6677362973950632418_n.jpg?oh=1b2a9e105dde6eec5bcaba54e6f11437&oe=54471F26&__gda__=1413443615_8c2113d401e08171f9ce97f9185c9d64

-SD

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PostPosted: Fri Aug 01, 2014 8:35 am 
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How many more "no" do you need :)
Running 30mm Challenge Almanzo on my (regular short reach) road bike and they just about clear the chainstays and brake bridge.

Unfortunately medium reach (roughly 50-60mm) frames a few and far between, kudos to Felt for making one.

if your riding habits are similar to mine, preference for roadish bikes and mixed tarmac/gravel, they seem to hit the sweet spot. Of course there's still the possibility of 650b conversion with long reach calipers like Tektro R559, and this is what I have to give a try next.

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PostPosted: Fri Aug 01, 2014 8:52 am 
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Depending on the frame (especially one that uses short reach calipers) it'll also jam between the chain and seat stays, rub the brake bridge and wedge under the fork crown.
I've raced dirt tracks on 23s and now run 25s for training round here, which has a lot of roads that aren't surfaced, just packed gravel/dirt.


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PostPosted: Fri Aug 01, 2014 3:08 pm 
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32mm tires, measured 30mm fits barely on my FM066SL frame. Calipers can reach easilty, without any problems.

Rear wheels fits perfect, and front wheel, tire touches the fork a bit on the top. (not a problem for riding, but still touches, so I don't ride)

If my hubs would be 2mm further than the place they are now, tires would fit perfect without any brake problems also.

edit:
Sorry I forgot to mention. I have Ultegra 6800 brakes.

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PostPosted: Fri Aug 01, 2014 11:26 pm 
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I've been able to fit 32mm cx tires in short reach 105 calipers and I've had trouble fitting 25s in the same brakes on a different frame. there is no certain answer to your question, it depends on the brake, it depends on the tire and rim combination, it depends on the frame.


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Posted: Fri Aug 01, 2014 11:26 pm 


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PostPosted: Sat Aug 02, 2014 5:27 am 
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Rim width has a lot to do with it - tyre profile is pretty nominal and it's actually based on the bead to bead width with the tyre is spread flat, divided by 2.5 - so a nominal 28c tyre will measure around 70 mm bead to bead.

In a C17 rim, this will sit wider and lower than in a C15 or a C13 (where the tyre will be at it's "tallest") ... but generally 28 is the max you can get away with - you also have to factor in, if there is really small clearance and something jams in there - stone, twig, etc, on the front, especially, it's not going to be pretty ...

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