Designed to keep revolving un-sprung mass to an absolute minimum and power transfer at a maximum, Renthal Ultralight rear sprockets are 66% lighter than steel. High strength specially enhanced 7075 T6 aluminum alloy is used to create the perfect rear chainwheel, that is both lightweight, durable and strong. Computer engineered and tested to ensure a precise fitment, concentricity and load dispersion with tooth profiling to provide maximum power transfer. With Renthal's combination of high strength base material, cutting edge manufacturing methods and exceptional hardwearing surface treatments its clear to see why Renthal's light weight all aluminum rear sprockets can be found on the rear wheels of more factory race team machines than all other competing brands combined. Ultralight Rear Sprockets feature Renthal's self cleaning mud groove technology between each tooth preventing mud build up that traditionally leads to quicker wearing components.