Zipper’s has taken the hassle of converting your late model belt driven Sportster to chain drive, whether for greater durability, altered final drive ratio, clearance for a wider tire, cool old school looks, or all of the above! Front sprockets are steel, rear are made from extremely tough hardened 7075-T6 aircraft quality aluminum. Choose between high-wearing RK Pro O-Ring chain or RK’s brutally strong, non-o-ring DR (Drag Race) chain.