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What edge? The edge of comfort? If the Crr of the tubed version is lower it's probably due to thinner sidewalls or lack of inner TL skin neither of which are going in increase speed. Running lower pressures might be cushy but will negatively impact speed further. Given these are race tyres I'd expect people using them to be looking to performance rather than comfort, no?
hippy-
Yes comfort, because my Voyager Hypers are more comfortable without tubes.
I'm not talking from a racing perspective because I don't! But I don't think most people who buy gp4000s use them for racing either so I expect that will also be true with the gp5000s.
Isn't increased comfort a benefit in racing too, especially for people like you who go a really long way with a sore gooch?
If the real world puncture protection is less good that's put me right off them though.
Fox
Oh sorry I must have been getting mixed up. As you were.
Interesting that non-tubeless gp5000s are faster but I suspect in the real world the comfort of tubeless would give them the edge.