Shimano XT CS-M770 9-Speed Cassette Professional Shifting When it comes to mountain biking, you'll want to have a cassette that doesn't hold you back. The Shimano Deore XT M770 Cassette features "Pro Level" technology at an accessible price. The alloy carrier keeps the weight down and varying tooth profiles provide smooth shifting. One unique feature on XT, pins behind the largest cog, help prevent the chain from damaging spokes. Features Weight(claimed): 297 g Compatible with 9-speed drivetrains Fits all Shimano and Shimano-compatible 8/9sp cassette bodies | Shimano | Xt Cs-M770 9 Speed Cassette 11-13-15-17-20-23-26-30-34T, 9 Speed