I've ridden bikes all my life. Now nearing 50, for the past year or two I've noticed that when I ride over 20km or so, my lower back gets extremely painful - enough to make it not possible to ride. The bike is the same one I've already had, so it's not a bike-fit issue.
Because the bike is breaking down, I need to replace it. I'm worried about getting a bike that I won't be able to ride for anything other than short commutes because of back pain...and not finding this out until the first 20km+ ride. A short test ride of a new bike isn't going to be enough to determine whether it will trigger pain. Knowing that it's the lower back, what style of bike should I consider? I currently have a mountain bike and am thinking either of a touring bike or hybrid. I probably don't have storage space for a recumbent.
Oh, and current bike is a mountain bike. In the past I did heaps of touring on it, with no issues. Now I use it for commuting, and sub-20km rides.