3/32" teeth (compatible with "narrow" single-speed race-style chains).
13th, 14th and 15th - 30mm x 1mm thread (small side of Flip Flop hub).
16th, 17th, and 18th - 1.375" x 24 TPI thread (standard BMX thread).
*Please verify which tooth count and thread style you need before ordering.
- Use Park Tool FR-8 freewheel tool for 13th, 14th, and 15th.
- Use Park Tool FR-6 freewheel tool for 16th, 17th, and 18th.