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@Velocio
Torque is only half the equation, the other half is RPM. On a bicycle we're talking around 100 RPM (YMMV) and on a motorcycle we're talking 3,500 > 5,500 RPM on some racing machines.
The chain has to deliver the torque at the RPM to give you power. That's where the issue is and why big chains on motorcycles are in use. Not because of higher torque, but because of higher RPM.
Delivering torque very slowly can be achieved with even lighter materials, it's when you apply the entire torque in an instant and need to do so continuously at high speeds that you need higher load bearing materials.