Bike seat riser-CeramicSpeed OSPW X Pulley Wheel System Shimano GRX RX820 2x12 - Aluminum Pulley Carbon Cage BLK

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  • This 13-tooth upper and 19-tooth lower OSPW System has been platform proven at races like Paris Robaix, Strada Bianche and CX World Cups
  • The system is built for gravel and cross disciplines and meets the needs for durability, low friction and longevity
  • The four spring tension settings allow customised setup based on ride conditions, and the handbuilt OSPW System offers custom molded carbon fiber cage for lightweight and durability
  • Reduces friction 35-40% over stock pulley configuration
  • Only compatible with the ‘2X-specific, RX820
  • If you are using a 1x you can use a 36T cassette maximum
    • TECH SPECS
    model standard
    compatibility Shimano GRX
    upper/lower 13/19t
    color black