I'm sorry if this is a repeat question. I imagine other people have had this problem. I used the search function but couldn't find exactly the info I was looking for. Anyways, In December I switched form a Specialized hybrid bicycle to an Orbea road bike. I have been riding consistently ever since I got it, and I've consistently had lower back pain when I get like 20 miles in to a ride. I'm trying to decide if this is a bike fit issue or a getting used to being in a down position instead of an upright position like on the hybrid issue. Anyone have a similar situation, or advice? Should I just wait it out, and it'll get better the more miles I put in to it? And at what point does your body generally get used to these changes? I pretty much have the smallest everything on my bike to fit my frame, I don't think I'm too stretched out from seat to handlebars, but could that be it? I've been doing pretty strenuous rides (long distances, big climbs) and that's new for me. The pain usually goes away shortly after getting off my bike too. Thanks for any advice!