Fahrrad Boost Standard. Once upon a time, the “standard” thru axle spacing for mountain bike frames was 100mm in the front and 142mm in the back. 170mm length, 10mm thread length; Fahrrad Heidemann 54290 Trier Fahrrad Fahrräder from fahrrad-heidemann.de Subsequently, this standard has been adapted to the different components (fork / hub / pedal / […]