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21” wheels to 20”

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Recently bought a 2014 P85+, currently has the 21” wheels. I’m sure cost wise it is more expensive to by 2 diff sizes of 21” (front and rear) then if you just got new rims and bought 4 identical size tires. Any reason to not move to 20’s?

Also stopped by the tire store today to look at a possible slow leak in rear tire. Nothing found. But the tire shop guy was telling my Tesla tires have foam in them and blue tooth. He said you can get without the foam cheaper but the ride is a lot more noisy. Is that for real? And what’s the BT for? Thought these had tpms sensors.