>>40236866Oh that looks like a nice place to drive, not too dense forest.
The bike not fitting is most likely the reason for the back pain. Well, either back or neck pain. Neck hurts if the handlebars are too low, back hurts if anything in my position is off (like saddle too high/low/far or frame wrong size, etc).
Since you like going fast, have you ever tried downhill (mountain) biking? Another city I often visit has a ski center that offers the slopes for biking purposes during the summer. Might go try it one day myself if I get a bike that's fit for the purpose.