[cytogenesis]

Originally Posted by churchx

If they are mounted on different wheels, why that would be any different as wheel swap? Just that if one uses tires on wheels for several seasons long without remounting/rebalancing, sometimes disbalance issues may occur. Like some wheel weights falling off, slight tire deformation from storing way or uneven wear and so on. If for long used wheel/tire you feel abnormal noises/vibration, it's worth to rebalance wheel&tire.

Car alignment (bit of camber/toe/caster, with camberbolts, camberplates, LCAs, UCAs, toe arms, eccentric bushings and such parts) doesn't change on wheel swap. And is usually set independently of tire mounts on wheels and often in different shops. It's just spacial orientation/angles you set wheel hubs to, that stays at it, no matter what weels/tires you mount on. One changes alignment in cases if one wishes a bit different handling or if there have been heavy hits to suspension and one suspects (maybe even feels) that alignment got out of whack and needs to be rechecked, not on wheel remounts.

I'm having trouble understanding your first paragraph. Are you speaking against only tire swapping or vise versa? Sorry for my confusion.