my son is almost 10 and I would like to buy a trail bike for his birthday. he is about 4'8" and I am 6'2". I grew a bunch after my sophomore year in high school, so I figure this bike will last him until he is driving. any suggestions on the size bike to buy and what type of gears, frame, etc, to look for. not looking to break the bank here but am comfortable with $500 on the high side. also would be interested in a used bike of the right kind. appreciate any help.
Don't go too big or get him too many sizes up so he can "grow into it". That can be dangerous. As for what to buy, hopefully you have a good bike shop around you but unless he's going to go hard core then buy quality but don't go all out either. Used is a mixed bag unless you can find a lightly used model. If he's ten I would look for a lighter bike so he doesn't have to fight the weight.