Looking for one for a 6 yr old boy. Is a 110 too big? He is mech inclined drives power wheels and a bike without training wheell since 2 days before 4 yrs old. But, he is fearless....what is the size under 110? Could he ride it for a couple years? Someone near Talkeetna gave him one but it is a death trap and I will not even try to get it running. He is heart broken, so let me know if you know of a reasonable one, probably under 110. Where can I find a chest protector? Thanks.