Quote:
Originally Posted by piersklein
Belt drive: belts don't stretch and I've only ever seen one break
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For the record, chains don't stretch unless exposed to many times their rated load. The holes in the large links do expand a bit, which tends to increase effective chain pitch, and produces an effect which looks like stretch.
Also for the record, timing belts do break. This is why most recent automotive maintenance schedules recommend replacement after about 90,000 miles. Given that autos are normally driven at something close to 60 miles per hour, this corresponds to approximately 1,500 hours of operation.
The big point that will probably decide what is best for your current application: belts are
much quieter!