When it comes to adventurous riding, a wider gear range is often better. The ADVENT cassette has the low gears to get up and the high gears to get back down. Steps between gears are optimized to give an even spread between shifts, reducing the need for double-shifting to find the right gear FEATURES: MicroSHIFT's “Wide Enough” 11-42T gear range works well for a variety of skill levels and riding conditions Machined aluminum large cog for reduced weight Chromoly cogs are continuously forged for strength and shifting accuracy ED black / anodized black surface finish Cassette Body Type: Shimano/SRAM 8, 9, 10 Speed Cassette Cogs: 11-13-15-18-21-24-28-34-42 Drivetrain Speeds: 9 Range: 11-42 Designed for ebike: Yes