The driving force behind busting out your biggest moves is always the chain and chainset. Sometimes riders face problems with their transmission- in the worst case suffering from missed shifts, chain suck, ditched chain etc. We created the new Rear Stinger for these people who want to get out there in a single speed style. Pure single speed or double switch? No problem. The Rear Stinger is fully adjustable for perfect chain alignment and it uses a proprietary return spring, so that the chain cannot jump off at the front chain rings. Material: 6061-T6 aluminum. With two ball bearing, anodized aluminum pulleys. Smart adjusting system for the chain line. Adjustable spring torque. Only for 8/9- speed chains.