When you twist the throttle, your motorcycle deserves more than just a link between engine and transmission- it deserves a lifeline of strength and precision. Thats where the S&S Cycle Heavy-Duty Primary Chain takes charge. Designed to handle the torque and horsepower of todays performance big twins, our chains deliver unwavering strength ride after ride. Heat-treated components and precision engineering extend chain life, reducing stretch and maintenance so you spend more time riding and less time wrenching.