Race,Steering Bearing top and bottom,Non-OE replacement bearing race. This version of the bearing race is just a bit shorter than the Z225 so that when installed, you can see just a little more gap where the loose ball bearings ride. This item receives a “B” rating only because of this stack height difference, it has no effect on the function or operation. If you are looking to save a little money, this might be your option for replacing those missing or damaged bearing races. Fits in to the steering neck on your hardtail frame. Fits in the Z50 KO through the K2 Z50A Hardtail frames.