mullinsm wrote:Keezx wrote:IF you compare 2 tyre sizes, then you should use tyres with comparable construction/carcass/thread, otherwise it's useless.
The 23,25 and 28mm were all Conti Gatorskins. The only difference apart from the size was the weight. Rolling resistance theory says the 28mm should be quicker on the roads in question, but they aren't. I suspect the difference therefore is the weight and I imagine that the extra 60g between the 25s and the 28s makes as much difference as the 60g difference between good wheels and very good wheels.
Weight does matter a little bit when accelerating but nothing noticable for your average speed.
No way 60 gr./wheel would have any significanty influence, the tyre width does matter for air resistance though.
My guess is you sit also a bit more aerodynamic on the faster bike.
PS 1 thing which isn't even mentioned here is the fact that the rim inner width influences the tyre width, contact patch and riding properties significant.
Food for thought:
https://intheknowcycling.com/2016/04/03 ... eel-sizes/I don't bother anymore about 23 mm or 25 mm , take what I can find for a good price, put them om 18C or 19C rims and pump 5-6 Bar depending on the expected road surface.