Q: How should I set up and maintain the 21-inch package?

Have it professionally mounted and balanced, torque to Tesla specification, set cold pressures accurately, and get a four-wheel alignment after installation to optimize wear and stability. Rotate square packages front to rear regularly; for the staggered set, monitor the shoulders and cross-rotate side to side when it’s due. Re-torque the lugs once the wheels have been through a heat cycle. On a 21 with less sidewall, correct pressures matter even more.