Renthal UltraLight Rear Chainwheels are CNC machined from 7075 T6 aluminum to extremely tight tolerances, 66% lighter than steel. Computer engineered and tested to ensure a precise fitment, concentricity and load dispersion with tooth profiling to provide maximum power transfer. A 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 many factory race team machines.. Renthal's in house CNC facilities accurately machine each individual rear chainwheel to the tightest tolerance possible ensuring an accurate and reliable fit. Specially enhanced 7075 T6 aluminum alloy is used to create the perfect rear chainwheel, that is lightweight, durable and strong. Renthal 19+ BMW S1000R/19-23 S1000RR/ 20+ S1000XR Rear Hard Anodized Sprocket - 520-42P Teeth. Features self-cleaning mud grooves between every tooth to prevent dirt build up. 66% lighter than steel

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