Or can I skip it and safely monitor for wear over the next few miles?

Situation is......car was just aligned less than 2 months ago, but as my old tires were just too unevenly worn (many suspension issues fixed over the life of those tires, and they lived on 2 different cars over 4 years), I bought new tires and went back to OEM wheels last week.

It was aligned on 225/45/17s and AMG 17x7.5 Monoblocs, and the speedo on my SL was always about 3mph too optimistic at 60mph. Now it's on OEM wheels and tires, speedo correct.

Does this necessarily mean an alignment is a must? The rolling diameter (height) has obviously changed, but that's all I can state for a fact

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former: 83 300D, 97 C230, 93 400E

current: 08 C300 Luxury , 92 500SL