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@M_V
After a little googling the figures for torque seem about the same for an average cyclist and the Harley Sportster.
The horsepower figures are massively different however as is the average/max speed and the amount of mileage that is likely to be/i have clocked up on the different types of bikes.
Perhaps the motorcycle industry has missed something and has been using chains twice as heavy as bicycle chains for no reason.
Think of the weight saving when they start using kmc 510 chains on moto gp bikes!
However, the argument was that the carbon belt drive would stretch and the comparison between carbon belt drive and chain drive on similarly powered motorbikes still stands.