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Cantilever brakes won't reach 650B rims, looking for options.

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Cantilever brakes won't reach 650B rims, looking for options.

Old 06-12-13, 09:47 AM
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Cantilever brakes won't reach 650B rims, looking for options.

I got my son a used Bianchi Volpe. It is a bit too tall for him. Going from a 700C (622mm) to 650B (584 mm) will drop the bike a significant (family jewls considerations) 19mm. With brazed on cantilever studs, it seems my options are limited unless somebody like Paul makes a canti arm that will drop the pad that much. Looking for ideas short of a new frame/bike.

Thanks much!

Gyro Gearloose
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Old 06-12-13, 09:52 AM
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Does it fit him other than standover? Stand over isn't a huge concern while actually riding.
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Old 06-12-13, 10:09 AM
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the other thing to consider is tires
there are very few narrow 650b tires available
and so the difference will likely be less than you think

the conversion you suggest is more commonly done with bikes designed for caliper brakes
the difference between modern long reach and short reach calipers is similar
to the difference between 700c and 650b

the ability to fit larger tires is the main advantage of 650b on road bikes
as the larger tires typically used on 650b wheels keeps the overall diameter close
to the 700c diameter
so handling doesnt change much

but if your bike uses cantis or already has spacing close to that of long reach calipers
your options are limited

you could go with long reach calipers
or some bmx calipers
and a drop bolt
i have never tried it but it is worth considering

option number three
sell it and buy a bike that fits
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Old 06-12-13, 11:56 AM
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Sounds like the bike doesn't fit, buy a new bike or frame that fits and be done with it instead of band-aiding the symptoms.
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Old 06-12-13, 01:25 PM
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Originally Posted by bobotech
Sounds like the bike doesn't fit, buy a new bike or frame that fits and be done with it instead of band-aiding the symptoms.
Unfortunately, that's what I think too.

Everything on a bicycle works together. You can almost never change just one part without affecting something else. In addition to the brake reach issue, how are the smaller wheels going to affect front wheel trail and handling? The crank is also going to scrape more easily on curves.
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Old 06-13-13, 07:40 AM
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Its likely the frame is simply too big for a a good fit,
and changing the standover distance won't fix that.
Bike with drops need to fit properly IMO.

rgds, sreten.
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Old 06-13-13, 07:42 AM
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I'd be worried about dropping the BB 19mm, heel strike with a pedal arm is no fun.
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Old 06-13-13, 07:48 AM
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Those super long reach brakes will maybe fit in the center bolt holes on Frame and fork?

You wont like the price of the USA made V brake[$100+ each] that may be sufficiently Adjustable ..

best, perhaps . (the option you didn't want)

Hang the frame in the garage till the child grows into it, and get something that fits until it's outgrown.

Last edited by fietsbob; 06-13-13 at 07:56 AM.
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