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R8100 11-speed Ultegra Di2 Series
This model is compatible with Shimano 105 R7100 electronic and R7000 derailleurs
we recommend using the cross bearings on road bikes
By replacing your stock 12-tooth pulleys and cage with a 14-tooth top pulley and a 19-tooth bottom pulley mounted on the stiffest cage available
Custom Cerakote Kolossos BB30 R8100 11-speed Ultegra Di2 SeriesElevate your drivetrain with the Kogel Kolossosour flagship oversized derailleur cage engineered to squeeze every last watt out of your ride. Crafted from precision CNCmachined aluminum, the Kolossos features highflow, lowfriction ceramic pulleys housed in sealed labyrinth bearings, reducing drag by up to 30% versus a standard cage. The result? Sharper, more reliable shifts under load and a drivetrain that spins smoother and lasts longer. Every detail
