Originally Posted by
Hairy Hands
If you have cantilever brakes and the posts are set for 700c your screwed, you have to look for a custom frame in 650b sizing, or you need to find long reach caliper brakes, or if disc brakes then your good.
You won't be able to use canti post that are too high, but there are ways to use canti post that are lower; 700c to 650b would mean you need a different type of brake, but maybe not with 26" to 650b.
Paul's Components and Velo Orange both offer brakes with more reach adjustment, and an adapter plate can be made to increase the reach of a standard V-brake.