Originally Posted by
FL_Gator
Ok, got a good test in. Personal feel, they are super super smooth on a typical cracked pavement flat Florida bike trail… and also feel very fast. However to check my confirmation bias I have two nearly identical test runs to compare.
It’s a 12.5 mile flat loop through the woods that is very circular. 2 loops 25 miles total. Same kit, helmet, socks, shoes, bottles, etc.. all identical. Temp within 5deg. Tried to keep similar body position, no drafting. All tires are GP5Ks.
RUN 1, 28mm front and back 74/76 psi:
25 miles
Avg 20.2mph
Avg 232w
RUN 2, 30mm front, 32mm back 70/65psi:
25 miles
Avg 20.9mph
Avg 208w
The only real variable here was wind. Both days had moderate wind, however since it is a circular loop I feel like you get equal benefit and penalty as you go around the loop that should essentially offset. Thoughts?
It's a start! Certainly it looks like there's no penalty. I'd suggest just riding the 30/32s for a few weeks on the roads you have been riding and see what you see.
I can tell you that I noticed the difference between the 32mm Corsas and 28mm GP5Ks in a single ride. The fact that you have power numbers, too, helps a lot. I don't. All I have is RPE.