Well the 2 years will be up June so I will give them a visual and check the tension before then. If there is no sign of fraying or surface cracks I'll let then run another year. For me that means 1000 miles tops ! As a maintenance engineer I have experience of these types of belts on automated machines and know they run for thousands of hours. Allowing for different running condtions and pulley sizing etc if they look OK then I'll be confident. Sometimes it can be a little paranoid to think a 23 month old belt is OK but a 25 month old belt has had it !
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