I don't think it is the right size because is squeals when reving the engine even with the correct tightness. thanks.
One more point to consider is that the squeal could be coming from the things the belt is driving - alternator or water pump for instance. Try removing the belt and see if either the pump or alternator feel like they are spinning freely.
I will definitely do that, thanks. The reason I think it is the belt is because i can smell the burning rubber after it squeals.