IRD Rock Jock Asymmetrical Derailleur Jockey Wheel Set, Black
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- Increase Derailleur Capacity: Boosts capacity by 2T, allowing you to run a larger cassette or a wider-range double crankset without a slack chain in extreme gear combinations (e.g., using a chainring setup with a 18T jump, such as 52/34T instead of the standard 52/36T) difference...i.e. 52-34t instead of 52-36t)
- Self-Adjusting Design: The asymmetric body pivots ("rocks") dynamically to align itself in the optimal position for every gear.
- Expanded Chainring Range: Increases the maximum allowable difference between inner and outer chainrings.
- Enhanced Efficiency: Oversized pulley wheels (14T tension pulley and 12T guide pulley) reduce drivetrain friction—no need for an aftermarket cage or a longer chain.
- Chain Stability: Reduces chain bounce over rough terrain.
- Precision Built: Features CNC-machined aluminum pulley wheels.
- Compatibility: Designed for Shimano 11-speed road and older rear derailleurs. Either SS and GS cages can be used. Some long cages may be compatible. Works with 11, 10, and 9-speed chains