I am 72 yrs old. 165lbs 5ft 9in tall. Have been wanting to buy a new Trek hybrid bike. I am interested in the FX and DS series. My local bike shop says it will be least November or early December before i can get one. I have been searching Craigslist and Facebook Marketplace for several weeks. I found a Trek Shift 2 yesterday. I have seen pics and talked to the owners daughter and son in law. The bike has less than 50 miles on it. The owner is 5ft 11in tall with a large gut. My concern is it is an 18 inch frame. That makes it a medium in size. I contacted Trek technical earlier. I am at the high side of medium and the low side of large frames. I am 2 hrs away from the bike. Driving there tomorrow to try it out. Do you folks have any thoughts on the purchase? Price is $425. Seems a little high according to bike bluebook. Thanks for any advice.