Thanks for the reply, Gus-Lopez. The Ficha technical only specifies the tyre size, which is correct on the machine. Maybe the speed limitation of the Grizzly, 45km/h on roads reflects the type of tyre available for quads?Look on the Ficha tecnica & see what size,type ,rating tyres it states. If they match up then it shouldn't be a problem but personally I'd want to change to something that didn't have that on the sidewall. normally they are only rated for a certain speed.