Quickshifter for Harley-Davidson Big Twins - Stand-alone Kit (EV-1 connectors) ZZR1200 A stock OEM differential is

A stock OEM differential is not setup optimal from our testing and R&D the OEM setup will shear the OEM recommended fluids causing micro pitting in the gear tooth face

The given tires sizes are the largest we fit without rubbing

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Quickshifter for Harley-Davidson Big Twins - Stand-alone Kit (EV-1 connectors) ZZR1200 A stock OEM differential isLike an automatic transmission for your Harley you can enjoy the simplicity of seamless upshifting after installing our Big Twin Quick Shifter Kit. Featuring simple plug and play installation youll enjoy an optimized ride in no time. This kit is specifically for Harley Davidson bikes with EV 1 connectors.