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- Box 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