The OSPW RS ALPHA for Shimano 9250/8150 Niro Special Edition is an elite oversized pulley wheel system designed to unlock enhanced drivetrain efficiency and durability. Engineered for use with Shimano Dura-Ace 9250 and Ultegra 8150 derailleurs, it features the patent-pending ADR (Active Debris Remover) bearing protection technology to keep grime and particles away from the bearings. Equipped with ALPHA disc pulley wheels for superior stiffness and reduced noise, and a reinforced cage for added strength, this system is built for serious riders seeking performance upgrades with refined style and precision.

This specifications are from the information the brand releases and only apply to stock bicycles, build ups´ specifications will vary according to the components the buyer chooses.