ACS Flip-Flop BMX 36 Hole hubs (Silver), feature CNC machined aluminum shells, 3/8" solid chromoly axles, sealed R6 bearings, and threading for 13 -15T  and 16 -   22T right-hand drive freewheels.  Thread specifications are M30x1 small metric threads  and 1.37-24tpi English threads. MADE IN TAIWAN

Outer locknut dimensions are 100mm front and 110mm rear for most SINGLE SPEED bikes.

This rear hub features a slide-off shoulder for easy freewheel removal. A pair of 2-pin removal tools is included to remove/install the lock nuts.

Dimensions for spoke calculations are:

Front:

100mm outer locknut

17mm locknut to flange, both sides

37mm flange diameter

2.5mm spoke holes

Rear:

110mm outer locknut

28mm locknut to flange, both sides

47mm flange diameter

2.5mm spoke holes