Miscellaneous The Z-Max Evolution is based off of Ritchey's signature MTB tread pattern, with lugs that have been spaced farther apart and shorted for faster handling and reduced rolling resistance. Tread lugs are spaced wider and shortened for faster handling, reduced rolling resistance and lighter weight WCS version features Dual Compound softer sides enhance cornering, firmer center section rolls faster and is more durable Published Weights: WCS 1.9: 430 g 2.1: 455 g Pro 1.9: 477g 2.1: 530g
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