Renthal 191U42051G MX Ultralight 51T Rear Sprocket (191U-420-51GESI)Renthal 191U42051G MX Ultralight 51T Rear Sprocket (191U 420 51GESI) Ultralight Rear Chainwheels Renthal 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,
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