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brakes that fit a 700c wheel on a 26" wheel (MTB) frame(7 posts)

brakes that fit a 700c wheel on a 26" wheel (MTB) frameslow-ron
Sep 16, 2002 2:11 PM
I've got this old specialized rock hopper MTB frame that I'd like to convert into a winter road/beater rig. I've got an nice set of older chorus/mavic 700c wheels that fit in the frame but the canti posts aren't even close to the rim.

Anyone know how to easily make this frankenstein set-up work? Other than buy MTB wheels.

thanks
re: brakes that fit a 700c wheel on a 26" wheel (MTB) frameschills
Sep 16, 2002 2:19 PM
Disc brakes. Then you can switch between mountain and road wheels whenever you want.
???Disc Brakes on Chorus Hubs????Spunout
Sep 17, 2002 3:48 AM
Maybe a better set of Cantilevers, or V-Brakes, or just pads with very long posts so that you can adjust them. Or, does the fork have a hole drilled so that you can mount a set of calipers?
Not enough adjustment in the brakes?cory
Sep 17, 2002 7:42 AM
When I swapped the 27-inch wheels on my old Trek for 700s, there was plenty of adjustment in the cantis to make them work. If you haven't fiddled with all the adjustments, it's worth a try. Different brakes have different limits, so if that doesn't work you might look around for some cheap cantilevers. Rivendell seems to have lots of information on how far different brakes can be adjusted.
ask on MTBR "brake time" forumoff roadie
Sep 17, 2002 9:38 AM
Folks there have done it before. I remember somebody posting a link to a company that sold a gadget like a brake booster with brake bosses mounted above the normal bosses, for just this purpose.

However, I do think you could try some other brakes. Lots of those old MTB frames have holes in the right spots for calipers. They may originally have been for reflectors or something, I dunno, but I've seen it done with old Cannondale MTB's and the results were sweet. Or you could try BMX brakes- I think thier "post to rim" distance is longer, and they use the same cable pull ratios as calipers and cantis.
no tabs for disks (neat thought) thanks for all the ideas (nm)slow-ron
Sep 17, 2002 3:39 PM
re: brakes that fit a 700c wheel on a 26" wheel (MTB) frameJambo
Sep 18, 2002 10:30 AM
I've done it. I had an old beater that I stuck road wheels on, but I have since switched it back to a real mountain bike.
Paul's makes a set of brakes that has enough adjustment, but like most other Paul's products they aren't cheap. The only other ones I could find were Onza HO V-brakes. When Onza came out with the V-brake version of their brakes, they just extended the brake arms to be long enough for a side pull cable. You can move the brake pads as high as you want on the arms. The cylinder of the brake arm is slightly smaller above the normal pad placement area, so you can't clamp the pad part down. I slipped a small folded piece of foil inside to take up enough space. Onza has been out of business for quite a while, but I found some used online. They worked, but the setup made a lot of noise. The pads had to be moved so far away from the bosses, so that amount of distance created a lot of vibration. A lot of that was also some play in the 'old' brakes.
Good luck with it. My solution worked, but maybe you can come up with something better. I had so many people look at me crazy when I tried to explain what I wanted to do, so I was pretty happy when I figured it out.