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Re: Gearing efficiency

11 July, 2011 12:11PM
Hi Murray,

I can't answer your question but I'll throw up a couple of observations.

I'm not too clear what is meant by efficiency in this context. I guess fundamentally that it is the ratio of the power you get out of a system to the power you put in but quite how, and under what conditions, you measure those things is not straightforward. For example, how do you sort out the losses in the bearing systems needed to make the measurements from the losses in the drive itself.

Also, I'm not surprised that you are finding a lot of different answers because I doubt if there is a single answer for any given system and I would not be surprised to find that there is as much variation within a system as there is between systems. Take the chain drive for example. The efficiency of a finely made chain running on beautifully cut gears in perfect alignment on top class bearings will be very different to the situation to that found on the average bicycle.
Subject Author Posted

Gearing efficiency

Murray R Langton 11 July, 2011 11:31AM

Re: Gearing efficiency

DocB 11 July, 2011 12:11PM

Re: Gearing efficiency

cotterpin 12 July, 2011 12:38PM

Re: Gearing efficiency

Murray R Langton 12 July, 2011 04:47PM

Re: Gearing efficiency

cotterpin 12 July, 2011 07:39PM

Re: Gearing efficiency

Murray R Langton 13 July, 2011 02:03PM



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