I want to buy my girlfriend a new bike. Shes tired of riding the quad and watching us have fun on the bikes. She is a beginner, 6 feet tall, 140lbs (she will kill me if she knows I posted this info). I was thinking either a CRF 250 or a CR 125. I would probally put a fly wheel weight on the 125 and gear either one down. I'm leaing towards the CRF - just because its a little more user friendly - no mixing gas, etc. We like to ride mostly trails - sandy and rocky with lots of hills. The other girls that come riding have a CR85, CRF 150, TT 150 but these bikes are to small and I dont seem to have enough power. She sat on the a new Cr125 and it seemed to fit her pretty good. I would appreciate any suggestions.