Berties
Fast and careful!
its still work in progress ,I've been recommended to try 25,I've got 23 on my aero,and 28 on my winter,I've stuck to 23 for so long,thanks for your inputI doubt you can feel it. The resistance is measured in grams and from best to worse is a couple of grams. If you turn your head sideways at 10kph there is more of a change in resistance. Various tyres give different acoustic feedback and most people associated a higher pitched tone as less resistance, although it isn't necessarily so.