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Axle end caps for R45D, ISO, and Boost Centerlock Hubs.
PHB571 is used on the drive side of ISO and R45D rear hubs, and the non-drive side of R45D front hubs.
PHB575 is used on the non-drive side of ISO and R45D rear hubs, both ends of twin-bearing Boost/Super Boost rear axles, and the drive side of R45D front hubs.
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-Chris King Precision Components
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