| http://www.w3.org/ns/prov#value | - While this slightly reduced performance, it greatly increased the durability of the belt.I suspect this is the real answer, in that the manufacturer / designer makes a trade off between reliability / durability and other factors such as weight, performance and cost.Oh & in relation to valve timing in cars, one of the main reasons for belts is that they do not stretch and so maintain much better ti
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