First Components Cassette rear sprocket. 42T - 1x10.
Full Black CNC machined 7075 aluminum. Weight: 80gr.
For conversion of 2x10 or 3x10 transmissions to 1x10. Compatible exclusively with removable cassette sprockets and 10 spd cores.
The 15 or 17 sprocket should be removed to preserve proper gear. Extremely light (80gr) thanks to its machining with a 12-spoke system. Specific machining to correctly position the rest of the cassette on the sprocket. Complete the transmission system with the chainring Ref. 41603. Includes longer shift adjustment screw, for correct installation and operation (M4 x 25mm)
Lighten your bike, eliminate cables, derailleur and shifters, move to the single chainring!