My wife an I plan to get my 6 year old daughter a quad for Xmas but I can't decide if I should get a 50 or a 90 for her. She's pretty small for 6 so I'm leaning to the 50 but I'm not sure. When I was 6 and about her size my parents got me a Yamaha 100 and as far as I can remember I was fine. Anyone have any input on this? The ultimate plan is for her to learn on this bike then pas it to my 2 year old son when he's big enough and get her a bigger one.