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Old 10-15-2017, 10:13 PM   #21 (permalink)
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If that's true, that's really awesome for the notched V-belt. The advantages sure would outweigh the roller chains.

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Old 10-15-2017, 11:41 PM   #22 (permalink)
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It is likely cheaper to manufacture a sheave system than to cut a bunch of gear teeth.
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Old 10-16-2017, 01:23 AM   #23 (permalink)
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If you ask me (even though you didn't), the way to go would be to have a CVT for getting up to speed, and then be able to switch it in to a fixed gear once up to speed.

I also assume the reason belt driven CVTs are only 80% efficient is slippage, which is the main reason friction belts are less efficient than chains, and why a timing belt is not. The other losses come from flexing/compressing/decompressing the rubber.

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Old 10-17-2017, 11:38 PM   #24 (permalink)
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A dual belt system with a V belt over a timing belt and a timing sprocket at the drive and the base of the sheave. Hmmm
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Old 11-13-2017, 03:38 PM   #25 (permalink)
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i believe the most common problems with the gy6 CVT are
the constant movement of the belt
(the clutch is on the wrong end)
and gearbox final drive
( each gear interaction cost a few percent efficiency)

I would move the clutch to the drive pulley like a comet.
A giant 17 inch serpentine pulley on the back wheel and a 2 inch
pulley on a real swing arm axle jackshaft
it would weigh less handle bumps better
and be more effective
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Old 01-02-2018, 11:34 PM   #26 (permalink)
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I have a bit larger bike I have tried using a flat cog style belt to compare to a sealed roller chain mind you this is final drive not in the transmission. This set up lost a average of 1.25 to 3 mpg on a 83 550 Yamaha Maxim. I tried thinking the weight reduction would help however it didn't. I put back on my chain after trying several adjustment. I even went as far taking drive pulley off and machining as much mass off as i thought remotely safe to do. http://www.cyclingnews.com/features/...ve-whos-faster found this link when i was trying to figure why.

Last edited by johnny77; 01-02-2018 at 11:39 PM.. Reason: http doubled
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