I bought a Miyata 610 frame and fork for my wife. It currently has side pull brakes. I would like to set it up as a 650b bike with Cantilever brakes. I have done 1 conversion already and it seems that in order to make the front brake work it requires extra long reach brakes. It did it on mine and am only so so happy.
So I was wondering about having cantilever posts added . Is there a minimum diameter seat stay required?
Thanks!

https://www.google.com/#q=clamp+on+c...r+brake+bosses

A few comments-


Before buying a clamp on canti boss set I would do a lot of home work WRT how wide apart the bosses will end up at AND how wide you want them to really be. I've installed a bunch of bosses over the years as well as repaired hundreds of bikes with them. Many (most all) current (as of the 1990s) cantis want a wider boss spread then what some of the images will get you. For best braking power this is very important. This is why when I do a canti install I require the wheels and the brakes to be in my hands so I can mock up their fit. Often I find I need to augment the canti base to better both fit the stay/blade and also end yo with the best width apart.


As to stay diameter requirement, no. But there is a range of effect at play. Obviously the skinnier the stay the more spreading flex there will be. To counter this iy is easy to fab up a post to post brace, much like was done in the earlier days of MtBs. Once I felt the need to add a half sleeve onto the stay that helped spread the support beyond the bosses base.


Hopefully who ever you chose to do this addition is well versed in canti set up and not just a guy with a torch. Andy.

Thanks for your reply Andy. I was planning to go to Joe B.

I am not a big fan of cantilever brakes. If you can reach the rim with a dual pivot, long reach brake, that will probably be superior. I have never heard of a problem with rear cantilevers due to seat stay diameter.

No Minimum.. but there is more torque windup, of the frame tube, and the posts spreading, in response to the braking forces,
of a smaller Diameter thin wall Tube.

then a Brake booster arch would help ( my Magura HS 33 Hydro rim Brakes include a Booster arch )

You also Have a Brazed on Pivot option with Center pull brakes .. New? Compass cycles or Pauls

May be Better with a small frame where you have heel strike potential ..




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