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One of the headsets is loose, front wheel loose, steering bar loose somewhere (beware don't just randomly tighten everything to the max, on some cargo's the steering components have very specific torque specs).
Also check spoke tension, had two UA from online retailers come in for a 'check up', both wheels spoke tension was low, the second one the front wheel was basically zero tension, was just flopping all over. Bike had about 40 miles on it from new :s
Anyone experienced front wheel speed wobbles on Urban Arrow or similar? I'm wondering if I need to tighten up anything on the steering mechanism. When coasting at between 18-22 mph I'm getting violent shaking at times