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@Autti
It's because a cyclist can develop a lot more torque than a motorbike engine.
Now considering that a Ducati 996 motorbike produces 93Nm at its maximum.
Now a 70kg cyclist standing on the cranks will be developing 9.8x70x(17/100) 116.62Nm
Because the sprockets they are applying this force to are almost equal radius (a 996 comes with 15 tooth sprocket as standard) it means the cyclist will be creating more chain tension.