ok - tonight i road the same 26 mile route that i road a week ago
same rest, same time of day everything equal except new wheels.
bike weight went from 20.2 pounds to 18.8 pounds from a change in wheels
so i had the same ave heart rate for the 26 miles but had an increase in ave speed of 1.5 mph
so better equipment can make a difference in performance - that is a substantial increase if you think about how much difference 1.5 mph would make over 100 miles