Assess my bike fit for randonneuring (something's off, pictures inside)
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Here's a few pics, various pedal positions and one in the drops. This is me, 191cm of height (6.2 feet) on my 61cm Bianchi Volpe. It's a bike I bought a few months ago. I want to get into randonneuring next season, and while I have some endurance, various aches and pains are limiting me. It seems to me some adjustments are needed for fitting this bike. It feels good when I start my ride, but usually about 100km (60 miles) later, I experience shoulder/upper back and lower back pain, or stiffness.
edit: after a long discussion and many helpful comments, this is how I look now (image flipped for better comparison, animated gif at the beginning of page two:
Before this, I rode a xc hardtail Merida, with not much problems comfort wise (it was not ideal, it had some issues, like numb fingers and some lower back issues, but something I came to expect as normal after a few hours in the saddle).
There are no professional bike fitters where I live, so any advice from you guys is welcome. I was considering moving the saddle a little bit back, but really, I have no clue, it would just be a trial and error thing, I thought maybe I could get a place to start from with your help...
Now this may be a core strength issue also, but I've done a bunch of exercises for that during the winter, and I know I'm stronger because I didn't have lower back issues when climbing steep grades this year (there is a 18+% hill it takes a few minutes to climb near me), which is something that was bothering me the last few years.
Excuse the jeans/sock thing, I was just going around the block so I'm not dressed for riding.
Here's a few pics, various pedal positions and one in the drops.