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@tomhirvin
They claim otherwise and it's in the warranty that it will not stretch.
"In laboratory testing, the Carbon Drive System lasts more than twice the life of chain. Chains are often replaced due to stretch and wear rather than actual failure. The Carbon Drive belt does not stretch, so the smooth running performance remains consistent throughout its own life."
This could of course be marketingwank, but it would be a foolish claim when they're trying to get this to be the trade standard rather than just a Mini-disc style gadget.