My wife has lost ~60 pounds since the beginning of the year so I'm feeling like I should probably lose some weight. I can't get my derailleurs to adjust so that I can access all 21 gears. I'm out of practice I guess. It is probably about time to replace this bike as I found it on my lawn like a decade ago.

I know we've got some bikers on here. I've always wanted a Nashbar generic bike. There is a dizzying array of bikes. I want a hard tail and I will be doing mostly asphalt and trails. What would you suggest?

Here's a pic of my current ride.