Originally Posted by
Luddite
I did 47km wearing well, Crocs with regular pedals with an inappropriately low seat.
The shoes could be a big part of the back pain problems because they offer no support whatsoever. I thought your seat was about an inch low -- that could contribute to the back problems too. It's good that you've raised your seat -- it'll probably feel a little "funny" at first, but after a short while, you'll be used to it.