Tires, Tires, Tires

If the inside edge of your current tires are going bald - you've got uneven wear and definitely need an alignment. If you don't do an alignment; you'll place that same uneven wear pattern on the new set of tires and pretty much VOID the mileage warranty. They will blame mechanical misalignment and/or suspension issues - not manufacturer's defect. This could also void your road hazard warranty.