I just two days ago bought a Trek 7000 wsd. It's a 16", I'm 5'4.5".
My old bike is a trek 800 that I have been riding daily around town for the past month (hadn't ridden it in 5 years) I haven't had any real problems with the 800 other than just wanting more of a street bike.
I love everything about the 7000, it's fast, nimble and I thought very comfortable, but after about an hour of riding my middle upper shoulder area got very cramped and sore. I rode it again today for only 15 minutes and same thing.
I have never had this happen on a bike before. Could anyone tell me what could be causing this, something I'm doing wrong? Is the bike the wrong size, or is there something I could adjust? I'm planning to take it to the LBS where I bought it to ask them, but it's not nearby. Please lend me your knowledge!