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Old 02-01-20, 04:57 PM
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Originally Posted by 63rickert View Post
Run in medium gear, direct drive, a Sturmey is 100% efficient. How much power is lost to heat in high or low gear is not resolved, different authorities have different answers.
100% efficient and heat loss do not go together. My 1st TT was on a SA 3 speed hub.

They have gear friction, they have oil friction. They have some slack in freewheeling.
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