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If you are using a bike with a 3 spd internal gear hub, the standard gearing usually a 48T chain ring and 19T hub gear. For 'stop and go' traffic or hauling a trailer I use a 40T chain ring. Riding at 50+ kph (30 mph) is plenty fast on these older bikes, some developed fork shake or wobbling. You really appreciate a good fairing at that speed. A kammback on the trailer would help as well.
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