Dicta quality freewheel Available in size 1/2"" x 1/8"" and 1/2"" x 3/32"" Comes in Metric BMX (14T and 15T) and English (16T, 17T, 18T, 19T, 20T, and 22T) Metric BMX dimension: 30 x 1mm Inner Diameter English dimension: 34.8 x 1.058mm (1.375 x 24 TPI) inner diameter 16T for Skyway Tuff wheels and older freewheel hubs with large thread 14T for a smaller thread on flip flop rear hubs.