OSPW RS 5-Spoke for Shimano 9250/8150

The OSPW RS 5-Spoke is more than a visual overhaul; it is a structural reinforcement of the most famous efficiency upgrade in cycling. Designed to significantly reduce friction and chain drag, the RS version features a reinforced cage for increased strength and better shifting precision under load. It introduces ADR (Active Debris Remover) technology—a patent-pending dust cover design that protects the ceramic bearings from mud and grit. The 5-spoke alloy pulleys provide a balance of lightweight performance and high-speed aerodynamics, making it the ultimate choice for riders seeking every possible "free watt" during races or high-intensity club rides.

Key Features

• Active Debris Remover (ADR): A unique combination of a grooved dust cover and a bladed structure that dynamically extracts debris from the pulley wheel while it rotates.

   

• Reinforced Cage Design: The new angular cage is stiffer than previous models, ensuring crisper shifts and better durability against accidental impacts.

   

• Handbuilt Ceramic Bearings: Features world-renowned CeramicSpeed bearings that are proven to be 3-5x more durable than standard steel bearings.

   

• 520% Efficiency Gain: While "free speed" is a bold claim, this system typically saves between 2-4 watts compared to a stock Shimano setup.

   

• Customizable Tension: Features adjustable spring tension settings, allowing you to fine-tune the balance between chain retention and friction reduction.

   

Specifications

• Compatibility: Shimano Dura-Ace RD-9250 and Ultegra RD-8150 (12-speed Di2)

   

• Pulley Material: Aluminum (5-Spoke design)

   

• Cage Material: Carbon fiber reinforced PA

   

• Bearing Type: Coated or Standard Ceramic Options

• Max Cassette Size: 34T (Standard)

Typical Components Included

• Complete OSPW RS System (Cage + 13/19T Pulley Wheels)

   

• CeramicSpeed Pulley Oil (15ml dropper bottle)

   

• Sticker sheet

• Detailed mounting and maintenance guide