Shimano Speed Kolossos Oversized Derailleur Cage - 11 and 12 speed Dura Ace and Ultegra Color:Raw then railing the hairpins on

then railing the hairpins on the way down

Whether you're shredding the trails

By replacing your stock pulleys with a ceramic 12-tooth top pulley and a 19-tooth bottom pulley

Check out our 12/14T oversized derailleur pulleys If you are looking for the best pulleys to fit your 11-speed Dura-Ace (R9100) and Ultegra (R8100) rear derailleurs

Ground clearance remains virtually unchanged—within 2mm of stock length without hanging lower

Shimano Speed Kolossos Oversized Derailleur Cage - 11 and 12 speed Dura Ace and Ultegra Color:Raw then railing the hairpins onKogel Speed Kolossos for Shimano 11 & 12 Speed (Dura Ace & Ultegra): The Fastest Oversized Derailleur Cage Yet Speed is the name of the game. The all new Kogel Speed Kolossos for Shimano 11 and 12 speed Dura Ace and Ultegra is engineered for the ultimate balance of aerodynamics, efficiency, and durability. Designed for riders who refuse to compromise, this oversized derailleur cage system is the fastest Kolossos ever, fine tuned to shave watts and