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Originally Posted by Jared341
I will buy that static tensioners are inefficient (seems obvious). But what about idler sprockets? Worst case you are adding in the friction of an extra ball bearing...
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My gut instinct is that the friction at the interface of the idler sprocket teeth with the chain would be a bigger factor (albeit still small) than the idler's ball bearing friction.
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The losses from such a system should certainly be dwarfed by factors like alignment, lubrication, and gearing.
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That's my guess too. Which is why it would be most instructive to see some real apples-to-apples data comparing a well-designed system to itself: with and without a tensioner touching the chain.