The overall power savings of the OSPW System for Shimano 9100/9150 /8000 reach 30%-60%, or more in some cases, over a stock setup.
The oversized pulley wheels have 3-5 times longer lifetime than the commonly used standard pulleys on the market.
The Shimano 9100/9150 and 8000 SS/8050 SS OSPW system is compatible up to a 32 tooth cassette for both Dura Ace & Ultegra derailluers.
Please note: The OSPW System for 9100/9150 and 8000 SS/8050 SS is NOT compatible with Ultegra 8000-GS or 8050-GS (medium cage) derailleurs, nor with the clutch equipped Ultegra RD RX800 & RX805. Please see our OSPW X for Shimano RX800/805 for a compatible RX800 & RX805 version. For a compatible upgrade for Ultegra 8000-GS or 8050-GS please see our Pulley Wheels for Shimano, 11s NW.
Regarding the maintenance of your OSPW System, it is important that you properly lubricate your bearings in order to ensure optimal performance and maximum longevity. Add oil by using the lubrication points on the back cage plate, so that oil can penetrate the bearing. Do this when you lubricate your chain, if you have washed your bike or after riding in wet or muddy conditions.