IRD Rock Jock Asymmetrical Derailleur Jockey Wheel Set, Black
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- Increase derailleur capacity by 2t so you can run a bigger cassette or run a wider range double crank w/o a slack chain in certain positions (i.e. run a chainring with more than the recommended 16t difference...i.e. 52-34t instead of 52-36t)
- Asymmetric design can "rock" to adjust itself to the best position for each gear
- Increase chainring total difference
- Oversized for increased efficiency, but does not need a new cage or extra long chain. (14t tension pulley and 12t guide pulley)
- Reduces chain bounce
- CNC-machined aluminum wheel
- 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