Here's a good deal on a Diamondback "Outlook" mountain/trail bike. It has a 17" frame, alloy rims, center pull brakes & a 3 piece alloy crank. This would be a great bike to get started in trail riding, or as a back-up for your current ride. Since the bike doesn't have shocks (use your knees), I'd guess the bike to be over 4 years old. The paint job has seen its share of wear/use, but the bike has been reconditioned & tuned up, so it's 100% functional & ready to roll. 60 bucks & it's yours.