17" Aluminum Extended Swingarm Disc Brake for SDG SSR 107 110 125 XR50 CRF50 and their Replicas and Pitster Bikes Rear Axle Hole: 15mm Raise: 1 Inch Extended: 4 Inches Some Modifications will be needed on the Swingarm. The shock and brake mounts will need to be relocated for the stock XR/CRF50. This Kit Includes: Swingarm, Chain Adjusters, Spacers, and Bearings