I’m relatively new to cycling so have only used a couple of different tyres. The tyres my road bike came with were garbage, so I switched to Gatorskin tyres for the puncture protection. Since putting them on I’d never really put much thought into changing them (assumed different tyres would only give a marginal advantage).
After reading this Training Peaks article I’m feeling pretty foolish! An 11:02 saving over IM distance by switching to GP 4000s
I don’t race IM distance, but that’s still a massive gain over an Oly distance tri.