>>1646784Rubber compound, casing construction, how well it interfaces with particular wheels, compatibility with intended surface, etc. Handling is also important. I've tried a few tires in that group (gp5k, turbo cotton, veloflex) and the turbo cottons handle extremely fast, gp5k feel smooth but slow on anything technical, veloflex are in the middle.
>>1646811Aero gainz comes from how well the tire is matched to the rim. For instance, if the rim is 26mm external and 19mm internal (like Boras), the best aero is a 25c tire that is closest to 26mm when seated and inflated.
