Renthal 121U42850GPBK Ultralight Grooved 50T Rear Sprocket Black (428 Pitch) • Expanded end and rolled

• Expanded end and rolled tips

• 25mm stock diameter axle

• Made In U

• Optimum cleaning agent

Renthal 121U42850GPBK Ultralight Grooved 50T Rear Sprocket Black (428 Pitch) • Expanded end and rolledRenthal UltraLight Rear Chainwheels are CNC machined in Manchester, UK 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. With Renthal's combination of high strength base material, cutting edge manufacturing methods and exceptional hardwearing surface treatments its clear to see