BOX Box Two Freewheel 18t MFPN=3159 Top part made of impact

Top part made of impact and pressure resistant polycarbonate shells

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Nordic - Ski - Core    LDC

} Single-ring drivetrain simplifies functionality and reduces weight X-SYNC wide-tooth

BOX Box Two Freewheel 18t MFPN=3159 Top part made of impactBox Two freewheels combine durability with lightning fast engagement Featuring nine super durable pawls and available in 16, 17 or 18 tooth To install, use tool designed for single speed freewheels with four notches that are approximately 32mm across measured inside to inside and 40mm outside to outside Fits 1. 375 x 24 TPI hub thread Fits 1 8" or 3 32" chain Model BOX Two Hub 1. 375"x24tpi Teeth 18 Chain 1 8" 3 32" Color Black