The standard specs that Tesla gives for 19" wheels are Wheel Specifications General Production (19 inch) Bolt circle (5x120mm) Hub center diameter (64mm) Wheel bolt size (M14) and cone angle (60°) The bolt circle pattern is 5x120mm. The hub center diameter is: 64mm Bolt size: M14x1.5, 60 degree cone taper Offset / ET: 40mm Tire circumference (2150-2193mm) Rim width (J-size): 8.0 (in inch) This is officially from Tesla that I got today. Now the question is that if I don't find the EXACT numbers for aftermarket wheels, then how much space there is for playing around still. Remember that I'm driving in heavy snow so I don't want to pack the car too close to anything with the wheels. So the main question is that if I want 8.5" or 9" or even 9.5" wheels, then what kind of offset is still acceptable. I guess the main limiting factor is front wheels. So if anyone can tell me what's the maximum difference towards the inside and maximum towards the outside from the nominal, then I can use various offset calculators available on the web and make sure the rims I pick fit. I'm kind of in a hurry as I'll be getting my car the first week of December and it comes with 21" and it's illegal to drive with those in December already so I need to have the wheels and tires (already ordered Hakkapellita 8 studded 19" tires, delivery next week) ready by the time the car arrives.