Bicycle Mechanics - "drop bolts" for 700c-650b wheel conversion
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08-03-09, 03:16 PM
I'm building up a small (47cm) frame road bike for my son. It's still slightly too tall for him, so I was thinking of trying out a set of good 650b wheels I have on the bike to see if I can get the top tube height OK for him for a year or so. I read the Sheldon Brown stuff on drop bolts to correct brake caliper reach and I noticed there was some sort of Campy part that his bike shop was selling, but it's now discontinued. So, I was wondering if anyone here can point me to some documentation on other (decently nice looking...but most importantly- SOUND) solution to correct the brake caliper reach on the bike (rear only..I think I'll use a 650b fork) in a way that will be completely reversible in a year or two when he's ready for 700c wheels on the bike.
and, for the curious, this the project as it sits this afternoon (with 700c wheels on it in the picture)
thanks in advance
08-03-09, 03:28 PM
sweet faggin. Campagnolo did made a drop bolt that would bring the brake caliper down a bit. Those bolts are quite expensive if you find em on ebay and there is no guaranty that the caliper will drop enough. Unless you want the bike to be period correct I would try a tektro or similar long reach brake caliper:
08-03-09, 05:39 PM
Thanks! I'm pretty excited about getting it built up for my son. I'm basically transferring most the gear from a mid-90s Allez to it + the fork & wheels from a similar vintage Nishiki NFS Beta (guess that's why I kept putting off building that bike back) to the Faggin.
It would seem I could use a small block of aluminum and drill/tap it with thread matching brake calipers...and, thankfully, it would only be the rear brake I'd need to do that on. I was aware of the Tektro brakes, but I figured I could probably machine up a widget to make it work for much less than the $70+ or so the Tektros cost and so far I'm not visualizing another use for the Tektros on one of my other bikes once he's 'graduated' to 700c wheels on the Faggin. Since brake pressure will be *towards* the bridge, I suppose the rear is a bit more forgiving in terms of design (ie, braking forces shouldn't be trying to lever the caliper off the bike quite as easily).
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