Originally Posted by
Route 66
Interesting. Thanks for sharing that.
No worries. It just so happens when I was an engineering student back in the late 80's I built a test rig to measure efficiency of HTD belt drives (like yours) vs the old style trapezoidal toothed belts that are now pretty much extinct. Power transfer efficiency is something like 97-98%. Chains are typically in the 96-97% range depending on lube etc. Not much in it. But I believe hub gears can bring the overall drivetrain efficiency down by up to 5%. But which is worse? A wet, dirty chain drive or a clean sealed hub? Probably not much in it and likely some overlap in extremes.