Is my touring bike badly fitted or just heavier than I'm used to?
This is my first post. I have been reading on this forum for a long time to learn things, but this time I feel as though I could need some specific advice.
I bought a touring bike a few months back as I wanted a bike to go camping with and to help me through hilly terrains that my day-to-day fixie isn't ideal for. It's a 46cm Surly Long Haul Trucker, a beautiful machine that I love riding. But I have noticed lately that I kind of stop loving to ride it on longer rides (>30-40 miles) because I start feeling very sore, particularly in my knees and lower back. My riding position feels very comfortable, it's quite relaxed with the saddle about the same height as the bars. I had a basic fitting done when I bought the bike, and I feel well fitted to it - until everything starts to hurt. This confuses me as on my 43cm Fuji track bike I can ride for much longer with no pain at all, despite the much more aggressive riding position and the fact that it is almost too small for me (I'm 5''1/156cm).
So I'm wondering now whether I should start messing about with the fitting on the Surly, or if it could just be a case of it being much, MUCH heavier than the fixie and I'm getting sore because I'm working harder, and I just need more training to get used to it?
Thankful for any ideas or suggestions!