Si wrote:I just wish I knew why it was slower on the flat! Av 'bent speed: 12mph, av upright (on a heavy tourer with quite an upright position): 13.5mph for the same 40mile ride done a number of times on both, over what you'd probably class as very gently rolling terrain. I know that you have to bed-in your 'bent muscles but I've been riding the thing for about four years now!
My riding experience on my grasshopper is quite different to my speedmachine and I'm not sure why. I can get higher speeds on my speedmachine on the same roads, and aside from the size of the rear wheel and riding position they are very similar spec. Both have the same drive train and are about the same weight.
It's not due to different measuring devices either because I use the same GPS Bryton device on both.