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Old 09-07-07, 08:24 PM
Retro Grouch 
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Join Date: Feb 2004
Location: St Peters, Missouri
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Bikes: Catrike 559 I own some others but they don't get ridden very much.

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Originally Posted by wahoonc View Post
Actually they aren't that far apart. IIRC the total efficiency spread between an internal gear and a dérailleur was only around 3% and quite often in certain gears the dérailleur was less efficient than the IGH. And quite often there are greater losses from wind resistance, riding style, low tire pressures, etc. Those items probably contribute more to speed loss than drive train efficiency.
I'm not convinced about your statement regarding internal gear efficiency. I've read some quite different numbers but, honestly, it's not the kind of thing that interests me so I haven't studied it in any depth.

As to the greater speed losses, I fully agree. Once you get over about 12 or 15MPH, compared to the effort that's required to push your torso through the air, everything else, including drive train efficiency, is small potatoes.
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