As TG intimated, here in a PNW winter I got 1300 miles out of a set of sprockets, completely worn out. The belt was worn but still fine. We never had any noise from our belt. Just used the "feels right" method of tensioning. Our belt never needed retensioning even though we had worn out the sprockets. We abandoned the belt, BTW. With the new lower pricing we might have stuck with a CDX belt, that is, if it had the lower pricing. I liked the "no black marks" quality of the belt and the bling factor was fun, but I thought we were a tiny tad slower with it. I think the frictional losses in a chain are less than the hysteresis losses in a belt.