Oversized pulleys, a stiff machined platform, and ceramic bearings, working together to take drag out of the rear derailleur. It is the loudest upgrade you can hear the least.
Why riders run one
01
Oversized pulleys
Bigger wheels bend the chain less, so more of your effort reaches the road.
02
Ceramic bearings
Hybrid ceramic internals for lower friction and a longer service life, all weather.
03
Serviceable, not disposable
Rebuildable and backed by Guaranteed Performance.
Pick your fit
35% off* for the next 24 hours. Fits most drivetrains.
Speed
Kolossos
The all-rounder. Max efficiency for road and race.
