I know I'm way late to the party here. Has this been well tested? Are you all certain about model 3 not minding having different circumference tires on each side of the car? I know it doesn't use limited slip differentials (clutches or such), but won't this trigger some level of slip detection if one side is different than the other? It's all good to get something with the same ratios printed on the sidewall, however, different tires (even from the same mfg) can vary significantly from those numbers. Whether this causes damage or just digital confusion I do not know. Seems like it would be a good idea to test travel distances per revolution and adjust spare inflation accordingly. Unless of course someone has driven and shown different radius tires don't cause a problem?