willcee wrote:I would question you on where you think or even know where the torque you claim disappears.. where it ends up ...cause it does not disappear ...nor is it lost in the chain... I know from thousands of fast miles that my unmodded 1 hp Mid Motor with a claimed 80/100 nm takes me 200 and a 52lb bike 252 approx lbs to 35 odd mph where attainable on the flat like the proverbial wind at a high cadence and in no way would a lesser torque figure manage that pulling a 46x11.. not forgetting that the torque is available from 10rpm to 120rpm ..will
I'm only stating well documented power losses through the chain and of course how torque varies with the different gearing ratios, higher speed less torque etc, nothing controversial or debatable I would say. If you google 'power loss through a bicycle chain' you should get many different sources of information. That's not to say the figures I've given are exactly right it was a guesstimate based on what I've read previously of about 3% loss but a slightly greater loss with an ebike but whatever there is always a fairly significant loss of power through a chain. I always try to be fair and unbiased in what I write. It's also worth pointing out that chains become less efficient as they wear and mid-drive motors cause far more rapid chain wear so its quite likely they will typically be at a higher wear rate on the chain which is why its claimed there is more power loss through the chain with a mid-drive motor unless its some other reason, i.e. two different sources of power acting on the same chain which might make power delivery through the chain more erratic and less smooth.