it is the standardized format for BMX freewheels, however, the AC racing freewheels use the same tool as you use for splined bottom bracket cups (shimano sealed types). Other than that exception, however, all of the ss thread-on freewheels that i'm aware of use that 4 prong style tool. You cannot really see it in the picture of the tool, but it (made by Park - FR-6) has a hex head on the back that you can fit an adjustable wrench over for turning. assuming that it's a standard thread-on freewheel, you should be able to put it on the non-fixed side of your hub. hope that helps