Originally Posted by
NightShift
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.
Well, speaking from experience I had a 700c Cyclocross frame that I wanted to use 650 wheels on but I was unable due to the brake post being too high as designed for a 700c wheel. I could have possibly removed the posts and used a long reach caliper brake, but I didn't like that idea. It seemed obvious to me that yes you could use a lower post but then that would make the frame designed for something other than a 700c wheel.
Maybe we are saying the same thing just not understanding each other.