SMD Supermoto rear axle blocks not only look stunning but perform an important job of protecting your machine should the worst happen. Rear replacement bobbins are available and are the same fitment for either axle and manufactured out of a hard wearing nylon known as Delrin. These are designed in such a way as to make wheel changes as effortless as possible . These will fit the Husky 450 FS models from 2015 and any new KTM SMR models that have a 25mm rear axle size.