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Yeh, it doesn't make sense!
I just feel way faster, more natural and stronger on one bike over the other. My only conclusion is that there must be some small differences in the fits due to the different geometries... It can't be possible to have them both exactly the same surely?
jim1985-
Was/is your old bike red?
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Should be able to. First get your saddle angle correct. I use the bubble app on my phone and a piece of wood on top of the saddle (to take the saddle curvature out of the equation). Do this for both bikes on the same piece of floor in case of any dips etc. I do it using my turbo on the same spot.
Then get your saddle height and setback relative to BB centre correct first. You can get that identical on both bikes. Its useful to have a reference point at the centre the saddle rails to measure through to the saddle top. Having the same saddle on both bikes helps.
For setback you can measure from a wall to BB centre and then wall to saddle tip and take the difference. Once you have the saddle sorted, get the reach and drop from the saddle nose to the handlebars the same. For reach, depending on where you spend the majority of the time when cycling, you might want to measure from saddle tip to the hoods of your levers. To get the drop the same just measure off the floor to top of saddle and to the bars then take the difference. Get the height correct via stem spacers and the reach via correct length stem.
BareNecessities
Hovis
If the fit is the same then I can't see why your power output should be different.