Q: Why choose 20 inches over a smaller wheel on a Model Y?

Twenty-inch sizing sharpens initial turn-in and lateral support while keeping enough sidewall for stability and ride control on imperfect pavement. Because the forged UP-03 assemblies are lighter than heavy cast wheels, they reduce rotating mass and help the dampers stay in their ideal range, which supports consistent braking and mid-corner composure. If you want more cushion for rough roads, a 19 has more sidewall; the 20 leans sharper.