RENTHAL Twinring™ Rear Sprocket - 48 Tooth - Black 1540-520-48GPBK chains thin and lightweight ventilated construction

thin and lightweight ventilated construction delivers comfort and breathability

Hard carbon knuckle for superior resistance to impacts

Thin and flexible silicone wires make them easy to install

Front box logo art embroidery and side logo embroidery Flex back

Improved pedal modulation range for R models

RENTHAL Twinring™ Rear Sprocket - 48 Tooth - Black 1540-520-48GPBK chains thin and lightweight ventilated constructionInner ring is the same high strength Ultralight 7075 T 6 aluminum used for the standard Renthal sprocket Outer ring is electro less nickel coated steel for ultimate durability and is designed with the minimum amount of material to keep weight down The outer ring is expanded at 200C and then fitted over the inner; this interference fit combined with the wave pattern ensures a permanent bond for the life of the chainwheel The flat socket head screws add