Why Hookless is Better
More predictable/consistent compaction means stronger rim = higher impact resistance
With Zipp’s manufacturing process, a hard-tooled tire bed has a controlled thermal expansion while molding. This allows us to dial in the laminate to the fraction of a millimeter for ideal compaction at full cure. This results in a material density that is more durable with a higher impact resistance.
Optimized fiber-to-resin ratio in the laminate = lighter rim
The ability to use hard tooling throughout the manufacturing process allows Zipp to dial in the amount of resin that flows and is purged during the molding process. This results in the ideal fiber-to-resin ratio that gives the best strength to weight ratio. This optimization allows Zipp to place the optimal amount of material according to need, resulting in wheels that are hundreds of grams lighter than previous models.
Tighter tolerances mean better tire interface = safer to ride
A machined hard-tool surface allows us to control the important dimensions required by ETRTO and ISO and stay well within their tolerance range, specifically bead seat diameter, g-height, and outer diameter. Zipp’s hookless wheels are fully compliant international standards (details below).
No hooks mean cleaner transition between the rim and the tire = more aerodynamic
Without the hooked section of the sidewall, the transition from the rim to the tire is streamlined, helping airflow to stay attached.