Since I have been hammering around on my Haibike Trekking 4.0, I have had neck and shoulder aches. My neck muscles were sore and it was affecting my posture, giving me some cracking head aches. I couldn't figure out what it was as I had never had them before and been cycling for many years. It took me a while to figure it out, but the handle bars at 725mm wide were just too wide. I was reaching out too far. I cut them down to 600 and the bike not only looks more balanced, but it is easier in traffic and my shoulder ache is receding.
Just thought it worth mentioning in case anyone else is having the same problem.
Just thought it worth mentioning in case anyone else is having the same problem.