Fitment Series tires are the ideal complement to each Zipp Wheel family. Specific construction that matches wide rim profiles and low tire pressure. Expanded thread coverage for better cornering and protection. Casing Geometry for accurate tire shape and width. Optimized rim and tire interface for improved aerodynamics. Goodyear Vector R Z30 SW and Z35 are optimized around Zipp’s 303 Firecrest. Developed with volume and durability in mind. A short ply construction and sturdy 120 TPI casing is ready to conquer any road surface in any condition. Z30 = 325g, Z35 = 365g.