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I definitely notice changes to power delivery if my backside moves even a few millimetres forward or backwards relative to the bb. Hip angle and glute activation can make a big difference.
TTM-
I think this may be playing a part in it.
My lower back is getting stiff on the newer bike as I think my hips aren't as rotated as much as they should be and so my spine curves and my mighty glutes aren't firing 100%.
Am using the same saddle on each bikes so it must be something to do with the length (or maybe drop) from saddle to handlebars?
jim1985
Thanks Hovis, this is great.
I took the bike to the guy who did my initial bike fit to help me apply the measurements so they should be right, but i have shifted the saddle forward by about 3mm since he set it up as it felt more comfy.
I may get the tape measure out and have another look myself as the bike fitter seemed in a bit of a rush when he was helping me out. I reckon if anything is off it's the saddle-BB setback or the handlebar-saddle length, so it may be a case of changing stem
Have checked the crank length too, and it's the same on both bikes.
The mystery continues...