Originally Posted by
ironwood
Paul Components has a linear pull brake that will allow you to put a 700C or a 650B wheel in a mountain biKe fork. It isn't cheap however.
A cheaper solution is the
Mavic Cailper Brake Adjuster. It's designed to fit the Speedcity 700c wheels to 26" MTB frame/fork. It raises the brake mount point to the correct location for the rim.