Hello! I have an allignment 4 weeks ago at pepboys because i lowered my ride. ( Installed a tokico illumina shocks and tein spring) . Then 3 days ago i decided to replace my old kumho ecsta tires with 4 new pirelli pzero nero ms tires. My question is, do i need to do an allignment again? the pepguy told me i dont need to because nothin have change and it does not affect the alignment by changin the tires --- but i need to make sure--- so im askin you guys for your opinion . Thanks!!

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nope, no need to.

If you had coilovers and were adjusting the height a ton, maybe, mayyybe you'd need an alignment.

The best way to tell if you need an alignment is drive on a flat, straight road. Let go of the steering wheel. If the car pulls to the left or right noticeably, you'll need an alignment.

Don't forget to grab the steering wheel when you are done checking.

 

...or if you changed the diameter of each tire, significantly. Otherwise, dano is correct - no alignment!

BTW, an out-of-alignment condition may still allow the car to track straight. This would happen if the caster/camber is out of spec. and yet the rotational position, left-to-right was correct. As a general rule-of-thumb, look at your tires whenever you add air. If you see uneven weat across the treads, an alignment may be necessary.Most vehicles don't need alignments for many years.