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Is there a way to tell if an aftermarket 18“ or 19” wheel would fit M3P? I’m looking to downgrade when I get mine but not too sure which would fit. Does the M3P come staggered from the factory?
M3P is a square setup, 20x9 rim with 235/35/20. Lots of wheel companies make wheels that will fit the M3P without spacers. Do a search online or in this forum - you will see a ton of 19" wheels that fit the M3P. It's the clearance of the bigger brakes that are the key.
No, not by looking at the pics.
But reputable wheel dealers, like TireRack.com , Ttsportline.com , or EAS (as well as others), do fitment testing and will publish which of their 18" and 19" wheels will fit TM3P.
The wheels you posted from tire rack "ASA - GT14 - Gloss Gunmetal Silver Painted, 19x8.5" appear from their site to work and the last review of those wheels was from a 2018 Tesla Model 3P owner (go read it). Tire wise, you could go 235/40/19 (OEM stock) or 245/40/19 for a little rim protection. I would call tire rack, as they are very knowledgeable in wheels and tires - they do a ton of test and fitment.
If you are changing from the 20"x9" Uberturbine with +34mm offset then to keep the outside of the wheel the same distance from the fender you need a wheel with a +28mm offset. Most of the wheels you see have a +35mm offset. This will set the outside of the wheel 1mm (.039") deeper into the finder. I think a better choice would be +20 to +25 offset to set the wheel out a little.