I've put 1.25" road tires on my kids' mountain bikes for use on the road -- when we didn't want to go all out and buy them road bikes. They worked okay. I even use them on my old Rockhopper, which I ride on the road when the weather's awful -- my "crap bike." Here's a picture of the kind of bike the Trek 900 is -- an old style hard tail. I think it was even made in the USA. The old Treks did have some good points, I think.