The Oversized Pulley Wheel System (OSPW System) offers increased drivetrain efficiency with two 17-tooth alloy pulley wheels and extremely low friction pulley bearings.
- Grade 3 Silicon Nitride balls
- Hardened races
- Reinforced polyamide cage and non-contact seals
- Hand built in Denmark
- Carbon fiber cage
- Compatible with 9100/9150 and 8000 series - exception being the R8000 GS
