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26" wheel with road bike brakes.

Old 04-28-13, 02:04 AM
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26" wheel with road bike brakes.

Has any one tried Dual-pivot Caliper Brake for road bike with 26" mtb rim? I'd like to use STI shifters, but with 26" mtb wheels. The frame will be custom, so I can have it built for the brake. I just wonder if the Dual-pivot Caliper Brake for road bike will allow for easy wheel installation with 1.75" mtb tires. I'll be traveling quite light with 32lbs bike and 195lbs load of biker+baggages, so assume the brakes to be adequate.
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Old 04-28-13, 08:23 AM
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I am not sure what your brake issue is, but on two of my touring bikes I can't pull the front wheel off when my 2.0 width front tire is fully inflated. It is not the type of brake (on one bike cantilever, other bike has V brake with travel agent), it simply is that the tire is close enough to the fork blades that there is not enough physical room. Quite simply the width of the tire at its widest point summed with the width of two brake blocks is greater than the width between the fork brakes. In my case, no other type of brake will fix that, my only choice is to let some air out. (A disc would solve that, but I prefer not to use a disc brake.)

I think you want the cantilever brake studs to be fitted to the frame, I see no advantage to using caliper brakes.
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Old 04-28-13, 08:54 AM
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You would have to use long reach side pulls and you will limit yourself greatly on your tire size. Tourist in MN has the right idea of using canti's or mini V's and possibly a travel agent.
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Old 04-28-13, 09:12 AM
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In addition to tire size restrictions or having to deflate/reinflate tires whenever removing wheels (which is not such a big deal since you're normally removing them to repair flats), long-reach caliper brakes have less leverage and lower clamping pressure - they make for weaker brakes.

If you're having a frame custom built, it is usually relatively trivial to add cantilever brake bosses, which would allow you to mount superior cantilever or Vee brakes, both of which can be operated by STI/Ergo levers, although Vee brakes would require Travel Agent cable pull adapters. "Road" short-cable-pull disc brakes work with STI too, but this obviously requires different frame mounts.

Why are you paying for a custom frame?
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Old 04-28-13, 09:21 AM
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26" wheel with road bike brakes.

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Old 04-28-13, 09:36 AM
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Now you may understand why most MTB And 26" wheel touring bikes dont have bolt on brakes..

wide tire BMX an exception. but than cheap is the priority..

Going custom? frame built around V or Disc brakes is a more normal choice these days..

My 26" wheel touring bike has Magura's hydraulic rim brakes ,,they bolt on V brake frame fittings..

Id get both Disc And V/Cantilever mounts fitted on the frame, then you can test both brakes yourself..

Last edited by fietsbob; 04-28-13 at 09:40 AM.
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Old 04-28-13, 09:51 AM
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I think you could use the tektro r559 with 1.75" tires without a lot of hassle... if your levers don't have a quick-levers like the tektro levers than you might not be able to pull a fully inflated tire out of them but if you want caliper brakes they work and work rather well for being long-reach brakes. The r559 have a QR on the brakes themselves and if the brake levers have one too they basically spring wide open... I rode a bike with them and I'm heavier than the OP's stated load of 195lbs and never suffered from a lack of brake power. Modern dual-pivot brakes are plenty strong in this application I think.
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Old 04-28-13, 10:10 AM
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Originally Posted by wheelinthai
Has any one tried Dual-pivot Caliper Brake for road bike with 26" mtb rim? I'd like to use STI shifters, but with 26" mtb wheels. The frame will be custom, so I can have it built for the brake. I just wonder if the Dual-pivot Caliper Brake for road bike will allow for easy wheel installation with 1.75" mtb tires. I'll be traveling quite light with 32lbs bike and 195lbs load of biker+baggages, so assume the brakes to be adequate.
It's a common alteration to convert a bike from 27 inch to a smaller 700c wheel size. It's also common to change a 700c wheel size to a 650b size. How well these conversions work depends on the frame selected and the brakes used. In both cases it's possible to increase tire clearance on the bike frame since the wheel size is smaller.

Converting a 700c road bike to 26 inch is a more difficult conversion on several levels. First, finding a brake system that can reach from the fork crown and seat-stay bridge to the smaller diameter rim is very difficult. Another problem is that the smaller tire diameter will alter the steering geometry.

Touring bikes need to be very stable, changing the steering geometry of the bike by radically changing the tire diameter is not something that I can recommend.

That size 700c tire can you fit on the bike now? Have you considered a 650b conversion?
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Old 04-28-13, 10:18 AM
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OK, this is the brake I'm talking about. The reason I want to use this brake is because it is very compatible with Sti shifter. There is a quick-release lever, which I wonder if it's enough clearance to remove/install wheel with 1.75" tyre easily from fork or frame.
BTW I appreciate all the helps you guys have given me.
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Old 04-28-13, 10:32 AM
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I'll be traveling quite light with 32lbs bike and 195lbs load of biker+baggages, so assume the brakes to be adequate. The frame will be custom made. It will be purpose built, and not a conversion. I like Sti because I find it very ergonomic . I'd like to use mtb tyres because they are easier to get where I live, Thailand.
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Old 04-28-13, 10:35 AM
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That is not the only brake compatible with STI shifters.

The 105 brake is designed for and commonly used with tires that are 20-25mm wide. It will not open up enough to permit a 38mm wide tire to be removed. I just measured my 105 calipers - they open to a 27mm gap with the brake released.

You should either read our posts above or get advice somewhere else before you make an expensive mistake on a custom bike frameset.

You still have not explained why you need a custom frame. There are a number of touring bikes / framesets with 26" wheels already available for purchase:

https://surlybikes.com/bikes/long_haul_trucker

https://www.modernbike.com/search.asp...04831&SCPK=607

Last edited by seeker333; 04-28-13 at 10:39 AM.
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Old 04-28-13, 10:40 AM
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Originally Posted by clasher
I think you could use the tektro r559 with 1.75" tires without a lot of hassle... if your levers don't have a quick-levers like the tektro levers than you might not be able to pull a fully inflated tire out of them but if you want caliper brakes they work and work rather well for being long-reach brakes. The r559 have a QR on the brakes themselves and if the brake levers have one too they basically spring wide open... I rode a bike with them and I'm heavier than the OP's stated load of 195lbs and never suffered from a lack of brake power. Modern dual-pivot brakes are plenty strong in this application I think.
Much appreciated advice.
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Old 04-28-13, 11:16 AM
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Originally Posted by seeker333
That is not the only brake compatible with STI shifters.

The 105 brake is designed for and commonly used with tires that are 20-25mm wide. It will not open up enough to permit a 38mm wide tire to be removed. I just measured my 105 calipers - they open to a 27mm gap with the brake released.
As mentioned above, bigger tires have to be deflated. There's also a trick with the cable adjuster: set it up so the brakes are at the right distance when the adjuster is most of the way out. For extra clearance to get the tire out, crank the adjuster down temporarily. Yes, it's a hassle, but it can be made to work. I have 38mm Avocets on a Romulus frame with 105 brakes this way. It helps that those tires are not prone to flats.

Agreed on a new bike: get one with cantilever posts, or cantilever and disk. Frames made to expect that will typically have better clearance for fatter tires and fenders, too.
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Old 04-28-13, 11:26 AM
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though I stated above that a long reach side pull like those Tektros might work, there's are reasons why they are not a popular brake option used today. Take Seeker's advice above.
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Old 04-28-13, 11:59 AM
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You can also just take a pad off to remove the tire. I was just playing with an R559 front with my miyata's 37mm tires, there is a lot of room on these brakes and I think the OP will be fine with 45mm tires. If removing the front wheel fully inflated is a big deal it might better to use 1.5" tires but taking a pad off isn't a big deal to me.
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Old 04-28-13, 12:45 PM
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this is the brake I'm talking about.
that is a 105 Road bike brake caliper .

anything over 25mm is getting too big a tire, 28 is stretching it, no mudguard fits under , then.
Maybe you want to tour on a 700c Road Bike Instead, then.

it doesn't even have to be custom.. unless you really want one..

then that brake will Be OK. People tour on road / sport Bikes

even tow BoB bike trailers so they dont have to fit Racks on their bikes.


This is what would fit around a bigger tire like you describe wanting.

https://www.tektro.com/_english/01_pr...e&sort=1&fid=2

Last edited by fietsbob; 04-28-13 at 01:01 PM.
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Old 04-28-13, 05:45 PM
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Originally Posted by Tourist in MSN
I am not sure what your brake issue is, but on two of my touring bikes I can't pull the front wheel off when my 2.0 width front tire is fully inflated. It is not the type of brake (on one bike cantilever, other bike has V brake with travel agent), it simply is that the tire is close enough to the fork blades that there is not enough physical room. Quite simply the width of the tire at its widest point summed with the width of two brake blocks is greater than the width between the fork brakes. In my case, no other type of brake will fix that, my only choice is to let some air out. (A disc would solve that, but I prefer not to use a disc brake.)

I think you want the cantilever brake studs to be fitted to the frame, I see no advantage to using caliper brakes.
I made the comment in post number 2 above about having to let out air before I can remove a wheel this morning.

Since then I looked at a few of the bikes owned by my neighbors that have caliper brakes. Some of them did not have brake blocks between the fork and tire, the brake blocks were further away from the tire. Thus on those bikes you can pull a wheel that is fully inflated.

That said, I still think you want cantilevers or V brakes with travel agents. Brakes that are firmly attached to the frame and fork are in my opinion preferable to ones on the end of a long bolt.

One person above commented about mini-V brakes, but I do not know if your tires (and you did not say if you are using a fender or not) will clear mini-V brakes, the frame builder or bike shop should know what will fit. I have mini-V brakes on the rear of my foldup bike, but that has 1.5 inch width tires.

If you plan to use fenders, make sure that the frame builder knows that.

I have not used STI levers but I see no reason why they would not work with the brakes I am suggesting.
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Old 04-28-13, 06:58 PM
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Originally Posted by clasher
I was just playing with an R559 front with my miyata's 37mm tires, there is a lot of room on these brakes and I think the OP will be fine with 45mm tires.
Yeah, in so far as brakes go, I took a caliper to my R556's and I think 45mm tires would be A-OK. With both the caliper and lever quick releases opened, the brake pads are just over 41mm apart on my bike with CR-18 rims and 37mm tires - set nominally for a wider rim, I think at a minimum you'd get 'close enough' to clear 45s. The frame and fork will need to be designed to work with this set-up, of course.

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Old 04-28-13, 06:58 PM
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Just to clear up confusion on V's. Mini v's can often be set up to work with sti and without travel agents. The problem is that sometimes you won't get the stopping power that you would like unless you keep your pads set really close to the rim, with little forgiving clearance. And yes, you must deflate your tire to pull the wheels off. I've seen them set so close, it's tough to push the pads together to release the brake at all for wheel removal. There are many fellows that race cross who do use them though. Full size v's will require the travel agents when using STI, which is no big deal, I just hate the cosmetics of the things. A good set of canti's once set up can be very forgiving and provide plenty of stopping power. They were standard equipment for years on some the finest touring bikes produced and of course mountain bikes started with canti's before the V's took over, and now of course it's discs. Sorry to be so long winded, and oh, if you can afford the custom route, go for it, just leave yourself with some options down the road.
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Old 04-28-13, 11:46 PM
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Mini V target market is Cross .. tires bigger than 35mm and the brake cable wont clear the tire.
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Old 04-29-13, 03:32 AM
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Thanks a lot you kind guys. I never expected so many friends raking their brains to help with my obscene desires. I'll certainly take every comment and suggestion to mind. To be truthful, I've experienced many of the things and obstacles you suggested. The problem is I'm trying to get the best of every thing. I guess that I can get most things, but not every thing. Thanks again.
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Old 04-29-13, 04:17 AM
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Sorry, double post.

Last edited by wheelinthai; 04-29-13 at 04:19 AM. Reason: double post
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