Kolossos Shimano Ultegra/Dura-Ace Derailleur Cage

This oversized derailleur cage fits Shimano's DURA-ACE RD-R9250 and ULTEGRA RD-R8150 Di2 rear derailleurs.

Kolossos is the Greek word for a statue, much larger than the original subject. It seems appropriate for an oversized derailleur cage.

Imagine the performance of replacing your stock pulleys with a ceramic 12-tooth upper pulley and a 19-tooth lower pulley built into the stiffest cage on the market.

Besides being engineered for World Tour victories, Kolossos gives you lower friction, increased shifting precision, and better chain retention.

Ready to experience ultimate drivetrain efficiency? Start going faster with less effort today!

Please Note** Installing this oversized derailleur cage typically requires replacing your chain to accommodate the larger pulleys.