The King 300 Extended Jackshaft Swingarm Wide Tire Conversion Kit is the Ultimate Custom Modification for Sportbikes today. This Roaring Toyz Sportbike Phat Tire Rear End Conversion Kit is a true Bolt-On kit that requires no cutting,grinding or welding. The unique Jackshaft design allows for a centered 18x10.5" custom rear wheel with a Avon Venom 300MM Tire. These swingarms are engineered not only for awsome looks but to be 100% functional as well. The KING300 Jackshaft Extended Swingarm Kits will stand up to any abuse you can throw their way. Put this Kit on your bike and ride it everyday. WE DO and you would not beleive how much attention we get with them. Go ahead treat yourself... its your turn!!!