Originally Posted by
clones2
After riding and time trialing the same loop for 6 months and never being above 18.15 mph - and all of a sudden I gain 2 mph - never under 20mph avg again.... Well..... it wasn't the kale chips...
You got some small improvements from the weight decrease, more aero wheels, and possibly to a lesser degree from less mechanical friction in components and tire rolling resistance.
Then there's the plecebo effect of getting a new bike, and another possibility that your speedometer on the new wheels isn't calibrated to those wheels/tires.
To the extent you actually are 2 mph faster, dollars to donuts it's 90% or more due to the position on the new bike being more aero.