Socalrider, I'm not sure you want to take that chance. The Trek 5200 sure, but the 5900 is questionable. The 5200 uses 120 carbon whereas the 5900 uses the Superlight 110 carbon. The difference is that the 110 carbon is lighter (and thinner, if I'm not mistaken). I have a buddy that bought a 5500 back then because he wanted Dura Ace- which the 5900 has. The 5500 was essentially a 5200 frame with Dura Ace. The 5900 is a completely different frame. He claimed that at his 245 lbs. that the superlight 5900 wouldn't be as durable. Don't just take my word for it. Contact an LBS that can give you the answer on these bikes. If they say that they need to call Trek, get another opinion. However, if you find a shop that has personal knowledge of Clydes on the 5900, listen to them. Bike shops have nothing to gain by you buying a used bike so a knowledgeable one will give you the scoop on them. They are nice bikes and they ride well (better than the new Madones IMHO), but the carbon is different on that model than the other OCLV Treks. By the way, I ride on 700 X 23 tires and have never ridden on anything more than 700 X 25 and I'm 215 lbs( my heaviest was at 232). I rarely get flats.
Last edited by terbennett; 07-27-09 at 04:36 PM.