Just put new tires on an inexpensive bandsaw (14" Chiwanese), and found the upper wheel needed adjusting to an odd tilt.
Apparently the upper/lower wheels are not coplanar, because the band doesn't adjust to center simultaneously on both. I've tentatively identified the offset as 1/4 inch, and there's a joint between the upper casting and lower casting, so I can shim there.
How does this happen? Did the factory mis-grind those castings, or could it have bent somehow in use or transport?
Any words of wisdom before I pull out the big wrenches and do the relatively-major disassembly?