I ordered a 7.1 FX. Now, I am getting a 7.2 FX for the same price at the Trek store. I got a size 15 (I am around 5'4" and weigh 125 lbs) after trying a 17.5 (I barely cleared the crossbar). I will be mostly riding on bike trails and maybe on roads. Not on a mud path or anything.
Should I cancel my order on the 7.1 and get the 7.2 instead? I can't really understand the difference other than the price and the fact that the 7.2 has alpha black Al and puncture resistant tires. Any help on picking the right one is greatly appreciated.