The Ekar GT 13-speed cassette from Campagnolo provides an optimal cycling experience and helps achieve the best performance on tough routes and terrains.Small jumps in the lower gears - optimal cadence.Larger jumps in the higher gears - to suit all types of routes.With the right collars and adapters, the N3W cassette is compatible with all current and future Campagnolo 12-speed, 11-speed, and 10-speed groups.