I'm proably going to get the 4300 Disc for my dad for christmas but was wondering how good of a bike it is. It's like a 21" which is proably fine because he's like 6'1". I have a specialized FSRxc Comp and have never really done alot of riding on a trek. His old bike has a rigid fork and cantelever brakes so theres a big gap between the two. I just want to know thing like if it's durable or smooth. Any other info or pics would be great to.Thank's.