What is the interchangeability between Forks? From what I have seen all Gens are pretty interchangeable other that the Axle Diameters. The question I have is will the GEN 1 Axle fit in the later Forks? I have been told the diameter is different. 20mm in Gen 1 and 25mm in the later Gen. But that is where the wheel bearings ride, is the a difference where the axle goes through the Forks?