Sounds like you are on to something. Could also be a bent subframe, not uncommon. My old R90S had one which prevented the bag mounts from bolting on. It was easy to straighten with a couple 2x4's once I had a good bike to take measurements.
I haven't forgotten about this or given up yet, but on my last ride I noticed my rear brake is non-functional, so that's taking my attention instead (and I'm dealing with the 3rd-party seat). I'll send another update after I analyze the frame and seat to see where the misalignment is.
Tags for this Thread