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dinfern22: No need to change alignment on wheel or tire swap. With different wheels/tires alignment/geometry stays same.
(with exception when for some different alignment is needed to enhance wheel clearance due too wide wheels fitted for them to not rub).
You need one, when: 1) advised after initial car purchase, as stock can be rather not precise/out of whack, while still within ranges of 'passing', 2) if you install suspension parts of different properties then stock ones or installing which involves unbolting/retorqueing suspension, changing alignment in process (coilovers/springs/bushings/camberplates/control arms/etc), 3) if you had big hits to suspension and feel that handling started to acting up after that, 4) if you want different alignment then before (eg. more camber for more even tire wear at track, or different camber front-rear settings, to dial out understeer vs stock, or more stability under throttle with toe-in, or sharper turn-in with front toe-out, and so on ..)
Don't mistake though -car-alignment- with -tire-balancing-. Later should be done on any proper tire remount on wheel. Of course not when swapping to different wheels with premounted tires (balanced before), unless that balancing been long ago and something makes you think that they may benefit from that (eg. due uneven wear or bend somewhere you feel excessive vibration when driving with those wheels/tires).
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