I was just wondering if I would need an alignment after I install my new wheels? I'd assume no, but better safe than sorry!

Old setup:
16x7.5
offset 40
225/55/16s all around

New setup:
18x8.5 F 18x9.5 R
offset 38
245/40/18 F
275/35/18 R

 

It would be a good idea specialy in the back, with the 9.5" wide wheel. Just get a 4 wheel alignment.