I've got 54,000 miles on my stock Michelins and figure I'll need to replace them at around 60,000. I've rotated them regularly and all four of the tires are wearing on the outside. It is even wear across the tread but slopes across so the outside has worn more. I figure I need an alignment but am wondering if I should do it now or wait for the new tires. Do I need to do an alignment with new tires or should I get it done now? And when I do the alignment, should I do a 4 wheel or just the two wheel?