6 yr old - typically a micro or mini
10 yr old - often a mini ... 10 yr old kids with size junior
older than 10 ... some on junior ... many ride the expert sizes (?)
obviously kids vary significantly in size - so above just a guideline
Absolutely agree. Very much depends on individual kid - and I was assuming that 6yo & 10yo finishing season now will be bigger & older when the season starts again in June.... My 10yo was on an expert this year. Might have been a touch on the big size for him, but the junior was too small as well.... and you have to move at some point. Good point on the 6yo, you're right, most 6yo, and some 7yo, should be on a mini.
But
Millroy - the point is, get them the right size entry level race bike, used and 4+ years old, and you can most likely sell it for about the same as you bought it. The bikes haven't changed much in a while.