SFX Mini Single Speed Freewheels3/32" or 1/8". M30 x1 thread.Suitable for BMX13, 14 or 15 Teeth sizes.2 pawl mechanismBall bearingFits to Mini type M30 x 1 threaded hubs only.(M30 is typically found on BMX Flip-Flop hubs)Note: Always apply a little grease to the threads when fitting.Use TLSF2 Freewheel remover to extract. 2STTLSF2ISO 1.375" x 24 TPI threaded SFS series freewheels 16-22T are also available.