Motion Raceworks High Resolution Driveshaft Speed Wheel offers amazing quality driveshaft speed data with a high resolution approach to help smooth out your graph and deliver accurate data to your recording device or traction control. Our billet steel collar offers 18 pickup points for a hall effect pickup that reduces noise and allows for all of the benefits of a square wave signal. This piece is TRACK PROVEN and we only suggest purchasing this if you like to crush the competition! MRW driveshaft wheel can be utilized with nearly any data collection system as well as any EFI system. As long as your system allows for a hall effect pickup you are good to go! This collar comes with ID for all standard pinion yokes produced by nearly all manufacturers. The sizes below reflect the flat surface OD on your pinion which will match the collar ID. 1.812 1.875 2.125 2.187 2.5 (strange 8.8 yoke) Available for 8.8 (8.8 yoke sizing 2.5 inches is based off of the strange 8.8 chrome moly strange yoke ) and 9 inch rear end.