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A gravity defying cross country rocket ship. WEIGHTY GOALS Cross country racers know that every gram counts. Pivot's engineers didn't set out to cut a few grams – they insisted on slashing hundreds. Starting at 1845 grams, the Mach 4 SL takes a front row seat in the ultralight full suspension category and has the best stiffness to weight ratios we've ever created. OUR ENGINEERS PUSHED THE BOUNDARIES Optimized tube shapes, a more compact frame design, exotic hi-mod materials, and a dual upright, reinforced swingarm push strength and stiffness on this gravity defying cross country rocket ship.