Rear hub works on most 150cc/250cc Chinese go-karts with 10″ wheels  ( TrailMaster, Hammerhead, American Sportworks – Carter 150cc but not the Carter 250cc).

Some of the older models used smaller hubs, ( used on 8″ wheels ) be sure to measure wheel diameter before ordering.

Hubs come with studs but not the 10mm nuts. 

– Stud spacing measuring diagonally 137mm
– Center splines are 25mm