The key difference is that the tread cap and casing is all specifically made for Zipp 303-series wheels. The result is the VectorR 700×30 tire measures a true 30mm on Zipp's 25mm internal rims.
With these new VectorR 30mm tires, the tire construction is designed to create an optimal profile, tread contact patch, and aerodynamics. The tire's actual width is 30mm, which matches the outer rim width for a better look and streamlined airflow.
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