I need some help with wheel and tire sizes please (
@Mad Hungarian )
Looking at the FAST FC04 in titanium for 2021 Model Y Performance.
I don't mind a staggered setup especially if it will make the rear tires look better than a square setup from behind.
This will be a winter setup for me.
20" preferred.
What width wheel do I use and what tire sizes should I consider for the widths? Thanks in advance!
It's completely up to you if you want to keep the stagger in winter... personally I'd go "square" to maximize traction on snow and ice but if you prefer the looks of the stagger setup and are willing to go a little easier on it when the weather goes pear shaped you can certainly do it.
If you choose square:
Optimum 20" FC04 spec for efficiency is same as OE in that size, 20x9.5 with +45 offset, however we're sold out of those in Titanium until March. You can use the 20x9.5 +35, you'll just lose a few percent efficiency by pushing the wheels out that extra 10 mm into the airflow. Note that we do have the +45 Black in stock.
Tire size will be 255/40R20.
Be sure to select 20" diameter from the wheel configuration menu when prompted, this will reset it to expect the square OE 20" sizing.
If you choose stagger:
You can use that same 20x9.5 +35 in front and pair it with a 20x11.0 +45 rear.
Tire sizes will be 255/40R20 front and 275/40R20, which closely match your current front/rear 21" overall diameters.
Instead of setting the wheel config 20" I would recommend keep the 21" Uberturbine setting, the pressures are the same but this will tell the car to keep the staggered diameter tire calibrations for the different front/rear rpms.