Part of the sales pitch for my fancy mid-life crisis bicycle was that the belt drive was the same sort of belt used in car timing belts, so it'd essentially never wear out. If the car has travelled 80,000km, how far has the timing belt travelled? (On the bicycle the belt probably travels about 1km for every 10km cycled -- if it's engineered to last 800,000km of cycling then it should cheerfully see me out.)

Peter