Sprint on the flat or climb a steep hill: the 11-34 d cassette gives you the versatility you need. it is compatible with both the shimano 11- and 12-speed cassette bodies.・The combination of 12 well-spaced gears offers maximum efficiency and acceleration performance for all situations・Compatible with the new 12-speed and 11-speed road freewheel bodyCombinaison: 11-12-13-14-15-17-19-21-24-27-30-34TPre-assembled: -Packaging: Individually packed