Need some advice....I have a 2003 ttr125, great shape and it's for my 12 yr old, 5'7", 170 lbs, no expereince. He fell over just picking up my XR200 so I thought this would be a good learner. The price and circumstances were right to buy it. Can the wheels be upsized next year as he grows ? Also, my 14 year old, ridden one time, 5'11", 160 pounds and not overly aggressive. I would like to stay with the four strokes, under $2k. The TTR is way too small for his leg length and the XR is too heavy. Suggestions ? Mostly will be trail riding. I have a chance to buy a TTR 250, year is 2000...... and the guy wants me tio make an offer(it's clean) but I think it's too big for a beginner. Thanks for your help.