Commission by iABED Industries , the Gates RPM belt is superior to any belt on the market for this application. Constructed of aramid chords , the belt does not stretch under extreme load disabling the ever famous "supercharged squeal" other belt manufacturers are famous for. 1310mm inner circumference (not estimated and not converted from imperial to metric) and recommended for those running the Fluidampr 3.0T Supercharged pulley on a 189mm adapter ring.