Our Swingarme extensions for Yamaha R1 models are the highest quality billet aluminum Bolt On Swingarm Extensions available. Large 3/8 stainless steel fasteners are included - eliminating rusting and bending. These Swingarm Extensions stretch your motorcycle swingarm from 4 to 9 inches and require a longer chain and brake line (both sold separately. Proudly made in our Hendersonville, Tennessee - U.S.A. facility and backed by our best in the industry lifetime warranty, we guarantee quality and safety with every set we sell.