The Eagle F1 SuperSport R Aero tire targets Zipp's 23mm TSS rim, so it holds the exact shape that wheelset needs for the Zipp 404 and 454 platforms. Patent-pending AeroLip technology cuts drag at the tire-to-rim transition and adds pinch-flat resistance without stiffening the sidewall, so ride comfort stays intact. A 120tpi casing and the R:Shield anti-puncture belt back up that comfort with real durability on long rides. What Our Gearhead(R) Experts Are Saying:"I set this up tubeless on a Zipp 404 and the bead seated on the first pump, no extra sealant chasing to get it round. That's the fitment work paying off, not luck."