Been looking on Veloviewer for comparisons between 2 of my bikes. Managed to show those bikes for every ride in 2017. Stats as above. Guess which bike is the Aero framed stiffer one and which is the more relaxed, not so stuff one? Yup. Stiffer one is the Aero bike shown as Bike 1. Weight of both bikes is very similar. Both have equivalent tyres fitted, of the same width and pressure. Haven’t felt any more fatigued on the Aero bike. Rides are over the same range of routes. Considering I have done 26% more climbing on average, the 0.6mph faster average speed suggests stiffer is better? Or is it the Aero elements of the frame? Or both?