Cantilever Post Adapter - 650B to 700C - on a Velo Orange Polyvalent

[Erik_A]

I am trying to find a product that I know exists but I can't find. It is a Cantilever Post Adapter than screws into the original post holes and allows you to move them up about a 1/2". I want to modift my 650B frame to run 700C road wheels with 28c tires. The frame is a Velo Orange Polyvalent designed for 650B large volume tires.

I have seen these adapters for about $25 online (thought they were Paul Comp. or Problem Solvers), but was wrong. Does anyone have a link to these?

the frame: http://store.velo-orange.com/index.p...ent-mkiii.html (which I want to be able to adapt back to large volume 650B in the future).

[JAGI410]

Wouldn't some Paul brakes allow this to happen?

[Erik_A]

Originally Posted by JAGI410

Wouldn't some Paul brakes allow this to happen?

Yes, but I already have some nice CX brakes that I want to use.

I really want to find these adapters - it is driving me nuts. I know that I should have just bought them when I found them a month ago.

[donevwil]

These allow you to go 700c to 650b, a more typical conversion. I don't know if flipping them is possible to go in the opposite direction.

[Erik_A]

Originally Posted by donevwil

These allow you to go 700c to 650b, a more typical conversion. I don't know if flipping them is possible to go in the opposite direction.

Thanks - The "Elevn V-Brake Post Extender" is exacly what I was looking for!

How would I do this (in more detail):

I cut off an ground down the original post (they are not the removable type), then drill and tapped the stubs for M6x1. A stainless steel Grade 8.8 M6x1 button head cap screw with a stainless steel washer replaces the M10 bolt provided by Elven

700c = 622mm dia (311mm rad.)
650b = 584mm dia (292mm rad.)

delta = 19mm rad.

The "Elevn V-Brake Post Extender" moves the posts 16mm, and I feel confident my brakes can cover the extra 3mm.

[donevwil]

Now, reading the adapter requirements in more detail, I think it's a non-starter for you. I didn't originally realize posts needed to be removable. One would think an actual post mount version would exist but I couldn't find one.

There is always the V-brake with a LOT of adjustment as mentioned above, but then you'd likely need long pull brake levers. How about this ?

[p nut]

I know you've got brakes, but I've heard of people using Shimano CX brakes for 26-->650b conversion. It's got enough adjustment to use without an adapter.