Hi all. I hope that someone can help me. I am looking to buy a mountain bike for my 9 year old son. The problem is that he is a tall lad for his age 4'9", with inside leg measurement of 27". So would I be best getting a kids bike with 24" wheels and 14" frame, or a small adult bike with 26" wheels and 14" frame. I want the bike to last, but want him to be able to ride it safely. Any advice would be appreciated, as I do not know which direction to go. Thank you.