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what is the most efficient way to transfer torque ? the belt drive or the shaft drive?

in a motorcycle is the most efficient way to transfer torque ? I mind talking about speed.

Public Comments

1. shaft drive any chain or belt has stretch or looses torque
2. A belt is more efficient than a shaft. Every time you change the direction of rotation you lose energy. That is one reason why no race bikes use shaft drive.
3. the belt has the least friction of the three types chain offers the most gear ratio's for racing and the shaft has a jacking effect on the suspension which is undesirable for racing
4. shafts dont slip but the gears of the others can be changed for more torque
5. the belt is probably more efficient. But the shaft is far more reliable when the torque gets tuff.... I have witnessed two times when the Belt left the bike under hard acceleration...
6. Belt drive gets more hp to the ground