Not sure this will gain a lot of traction, I think this sub forum is pretty dead but the title caught my eye since I have a 10, soon to be 11 in May, y/o. Firstly, if he's interested in racing and it's his thing, just get him out there, regardless of how fast he can ride. I think getting more kids to join and participate is more important to only having kids 'fast enough' to enter, because otherwise it's always just going to be a select few competing. My son doesn't race, but we got him a road bike, and in our neighborhood we do a circular loop and we average 13ish, I'm sure it's not the hardest he can go because we don't ride hard, but I don't think it's too much higher than that. I don't know any any others kids who ride or race averages so I can't speak to the average 10 y/o, just my singular observation point.