Wanting to put that CR85 front end on your XR100 Mad Dog bike? Use the Johnson Engineering conversion stem to make it happen! Adapting a set of CR85 trees and forks to your XR 100 mad dog will give you an appreciated suspension upgrade. Use our conversion stem with your existing bearings cap and new forks and trees and they will bolt right up. You get in the package a new stem to fit your CR trees, a bushing for the top tree and a new top nut.