Complete 18" (18 Inch) Aluminum Frame Swing Arms Extension for Honda CRF50 XR50 50cc 70cc 110cc 125cc Stomp Demon X, WPB, Orion, M2R, Lucky MX, Thumpstar, Explorer, Braaap, Atomic, Pitpro, Pitster Pro, DHZ, SSR, Piranha And Many More Clones. Rear Axle Hole: 15mm Some Modifications will be needed on the Swingarm. The Shock and brake mounts will need to relocated for the stock XR/CRF50. Please check your measurements. Thank you. WILL ONLY WORK WITH DISC BRAKES. DISC BRAKES NOT INCLUDED. INCLUDES: SWINGARM, BEARINGS, ADJUSTERS, AND SPACERS.