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gillies
@Thrustvector
For a cargo bike I'd imagine a safe top speed depends on the geometry and the design of the steering linkages. I took my Kr8 past 30mph downhill and it never felt unsafe; the limiting factor was always braking rather than speed wobble. IIRC Henry from Workcycles once posted that an old racing mate of his had hit 100(!)km/h on a long downhill drag, though I don't think that was a recommendation...