My 10 year old (50th percentile in height) just now fits an extra small adult mountain bike, and it's almost too big. It has a modern diamond frame so stand over issues aren't huge. I would think a mixie would be a must for a normal sized 6 year old. Gears are great and really increase the distance they can go. Off the shelf options aren't very good but I was tempted by a kids sized cross bike by Redline.
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