When I changed from GP400S tires to ProRace3 I was very impressed by the extra speed from them. It was probably partly new kit adrenalin and maybe lower rolling resistance. But I noticed recently that they are maybe 1mm less diameter that the GP4K's and I have not adjusted my cycle computer at all.
How much difference might this make? Less than 1mph?
How much difference might this make? Less than 1mph?