Box Two Freewheels BX-FW15BFW18-BK

- Box Two freewheels combine durability with lightning-fast engagement\n- Featuring nine super durable pawls and available in 16, 17 or 18 tooth\n- 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\n- Fits 1.375 x 24 TPI hub thread\n- Fits 1/8" or 3/32" chain\n- 3rd party web sales must be an Authorized Dealer