I guess I am confused since the OP said this began after getting new tires. Did the problem surface right after you got the tires? If so you might have gotten a bad tire - it does happen.

If, on the other hand, it drove OK for a while and then started having a problem it could have nothing to do with the tires and purely be coincidence.

As for the alignment question - I would have the dealership do it. They generally charge $100-$150 for an alignment and sometimes it is more if they need to replace the camber bolts. Even if not the cause it is generally a good idea to have an alignment done with new tires because mis-alignment is a major cause of premature tire wear.

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Marty D.

2013 C300 4Matic
1984 BMW 733i
2013 Lincoln MKz