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Large diameter wheels roll over obstacles easier than small wheels so 21" is better off road but 19" is fine. There were some old dirt bikes that came with a 23" front wheel but I don't see those used any more. 17" front and rear is comon on street bikes for better, quicker cornering. Scooters are even quicker handling with 8" to 16" wheels. I've owned bikes and scooters with front wheel sizes of 8", 10", 14", 16", 17", 18", 19", 21".
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