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canti brakes for 27" to 700c conversion?

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canti brakes for 27" to 700c conversion?

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Old 06-18-10, 03:24 PM
  #26  
robatsu
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Originally Posted by southpawboston
the early shimano deore XT cantis from the deer's head era do well for adapting to 700c use on a fork with bosses designed for 27". model # BR-MC70. i have them on my shogun tourer and i test fitted a couple of 700C rims to see if they'd work. they do. plus they look really nice.
+1. I've done conversions on Trek 720/620 and one or two others. The Treks were the hardest, for some reason. Generally, you will have your best luck with post type wide profile cantis. Any sort of frogleg knockoff is a good candidate as well. You also may have to take a file to the backside of the pad in some cases. But again, starting with a wide profile, post type brake is the way to stack this in your favor. I don't think there is a worse case than the Trek 720/620 in terms of non-optimal, narrow placement of the posts, but I was able to make this work twice (with different brake models each time), so you should be able to make something work. On the Froglegs on the Trek 720, I also had to shorten the posts to avoid straddle wire interference, so bring your hacksaw/files.

That all being said, unless you have special tire needs, it may be a lot simpler to go with the 27" wheels. The only reason(s) I ever did the swap was that I was building up bare frames and already had 700c wheelsets.
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Old 06-18-10, 04:34 PM
  #27  
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You guys are making this way too complicated. Get 700c wheels, hack the canti bosses off, drill the fork and bridge, install long reach dual pivot calipers, never worry about the brakes or wheels again.
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Old 06-18-10, 05:31 PM
  #28  
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Originally Posted by Drakonchik
Woefully inadequate brakes, not fit for any person over 100lbs with any pads, or any cable setup, due to their inherent geometry. You are warned.

A heavy rider, or a loaded average weight rider, will find these brakes to be a pathetic joke.

And that's despite the fact that this model was stock on so many classic Japanese touring bikes. Someone at Dia-Compe must have placed some bribes in the right places to for the OEM's to stock them on so many otherwise fine touring rigs.
come on. those are pretty strong words for brakes that work just fine. i'm currently commuting with these on a 63cm bike with 180lbs of me + 30 of gear. i go down some very steep hills and they stop fine using 700c wheels (designed for 27").

i need to quit checking these 27" conversion threads. its like mac vs pc.
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Old 01-10-15, 01:51 AM
  #29  
rawly old
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I know, old thread, but maybe someone out there can help. I have a similar problem.
I converted one bike from 27 x 1 1/4" to 700/40, no sweat, but now I want to convert
a 26" mountain bike with pivoting side pulls to 700. Plenty of clearance on the frame,
any suggestions?
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Old 01-10-15, 06:40 AM
  #30  
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Easiest solution - https://www.biketrailershop.com/xtra...er-p-1600.html

Another solution - Moto BMX from Paul Component Engineering
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Old 01-10-15, 07:46 AM
  #31  
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This thread covers changing a 26" cheap mountain bike to 700c: https://www.bikeforums.net/mountain-b...tain-bike.html
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Old 01-10-15, 08:18 AM
  #32  
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Originally Posted by avocado
I love everything about my Miyata 210 touring/light trails/cx bike except the wheel size. It's set up for 27" wheels, which limits the knobby tire selection to 1 or 2 not-great options.

Does anyone know of a canti brake that has enough adjustability to fit 700c wheels to the frame? I'd rather stick to traditional centerpull cantilevers, but if there's a V-brake that will allow for the conversion, that would be fine, too.

Thanks!
Throw on a pair of 700c wheels and see if your brakes can be adjusted to work. I'll bet they can. I did this with a mid '80s Miyata 610 and used it as my winter commuter/workhorse with that setup for years. I would have to readjust the shoe angle mid wear, but that wasn't hard. There was a thread recently about this. Try searching for Miyata 610.

Ben
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