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You might want to verify that if you are buying tires without TPMS. I've been told by my local service center it's 600$ (Mississauga, Canada) and I've seen others write $500 on here...
Turbo - would you be interested in the 19's plus some cash for your 21's? I live near Fremont so we could do the swap right then and there at the factory and have Tesla mount the new wheels.
I picked up my car this weekend, came with Conti's. I already have a set of O.Z. Superturismo LM 19" wheels on order and plan to transfer the TPMS sensors to the new rims, so no trades. I am in the Seattle area, so no swapping at the factory. A full set of tires, wheels, tpms sensors and center caps are $5K+. My new tires/wheels will be here this weekend, so will be able to ship out next week.
I am happy to pay you $3,000.00 all in (including shipping). However I expect that shipping will be brutal. I live in Toronto Canada, if you can find a shipper to get them here at a reasonable price, we can do a deal.