I do some mtn biking. Im not into the downhill stuff. Lots of single track trails. I had a diamond back which was ok but I needed something built a little stronger since im a big guy. I ended up getting a trek cobia, gary fisher edition. I have had it about 3 months now and put about 120 miles a month on it. I really liked the 4300 models but this one called my name when I walked by it. 29" tires. Disk brakes. Better components, what my big ass needs. It rides super nice and takes the trails surprisingly better than my 26" bike. I also got a little better bike all around because of my plansto be in colorado this summer and doing more biking on more difficult terrain.