Originally Posted by
Camilo
do you think the cantilever brakes on an old 26" mountain bike have enough upward adjustment to accommodate 27.5/650B rims?
Depends on the frameset and the brakes. You're in a better position to know this than we are since you have the bicycle on hand. If not, Paul Motolites will likely work as a solution, albeit a pricey one, and the brake leverage may or may not end up attractive.
What's the motivation for using 650b over 26er?