With bigger cassettes come bigger pulleys. Designed for the Sram Eagle and Shimano 12 speed mountain bike derailleurs, these pulleys maximize the tooth count to reduce friction. Cross seals only. The specific 14 tooth upper and lower pulley wheels are built to last: aluminum cogs, serviceable bearings to resist the most challenging mountain bike conditions. Compatible with - Sram Eagle 12 Speed X-Horizon derailleurs - Shimano 12 speed mountain bike derailleurs

Kolossos is the Greek word for a statue, much larger than the original subject. Seems fitting for an oversized derailleur cage. Imagine the performance of replacing your stock pulleys with a ceramic 12-tooth top pulley and a 19-tooth bottom pulley built on the stiffest cage on the market. Besides being designed for World Tour victories, Kolossos gives you reduced friction, improved shifting accuracy, and better chain retention. Ready to experience maximum drivetrain efficiency? Start going faster with less energy today! Please note** Installing this oversized derailleur cage typically requires replacing your chain to accommodate the larger pulleys.