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i don't think its needed when i had my 20's on with the alignment done and took them off 4 bit do 2 the car going 2 the shop and put them back on afterwards no alignment was needed...but mayb get it anyway 2 b sure.. better safe than sorry...
well, technically changing wheels can mess up the alignment a bit, after all you are changing the suspension parts (sorta). but realistically it is usually ok, unless you raised / dropped your car