The Box Two Freewheel is available in 16, 17, or 18 teeth and is made of heat treated chromoly. This particular freewheel was tested by the Dutch National BMX Team. With a quick engagement and 9-pawls this can be installed with Park Tools FR-6 or other installation tool designed for single speed freewheels with four notches that are approximately 32mm across measured inside to inside and 40mm outside to outside. FEATURES 1/8th or 3/32 Chain Compatible ED Black Protection 108 Points of Engagement 9 Pawls Engagement System Heat-Treated Chromoly SPECIFICATIONS MATERIAL: Chromoly CHAIN: 1/8" or 3/32" HUB THREAD: 1.375 x 24 TPI ENGAGEMENT: 3.3° [108 clicks] FINISH: Nickel Plate ED Finish WEIGHT [16T]: 163 grams / 5.75 ounces WEIGHT [17T]: 170 grams / 5.99 ounces WEIGHT [18T]: 176 grams / 6.21 ounces
