A disc wheel gives away nothing from the outside — no rim depth to quote, no spoke count to compare. Zipp's Super-9 Carbon Disc Rear Wheel makes its case in the shape instead: a surface that runs wide and parallel from the hub until it feathers inward as it meets the hookless tire bed . Total System Efficiency is the framework behind it, and it treats wind resistance, gravity, rolling resistance, and vibration losses as one connected problem rather than four separate drag figures.

That framework explains the rim dimensions. 23mm internal width and 30.4mm external width hold a 28mm tire, which Zipp lists as both the minimum and the optimal size , in a profile that stays continuous from casing to carbon. The Super-9 is fastest with 28mm tubeless tires inflated below traditional pressure , and the hookless bed caps pressure at 73psi . That ceiling is the design intent, not a limitation to work around.

Because the rim is hookless, it takes hookless-approved tubeless tires only, though you can run a tube inside a tubeless tire . Tube-type tires are out. TyreWiz 2.0 is integrated out of sight and balanced within the wheel , sending pressure readings to a head unit instead of requiring a gauge in transition, and a redesigned pump-access port removes the sticker step entirely.... Read More