TLDR: I measured the front Performance Upgrade Option front rotor diameter at 355 mm (which is also a highly standard size, including from Brembo), and the rear at 332 mm. The front caliper to wheel clearance is large enough to probably fit an 18 inch wheel, but perhaps ironically the
rear caliper to wheel clearance may not fit an 18. However the barrel inner diameter of different wheels can vary by construction, so some 18s may fit while others may not.
Pictures, measurements, and analysis below:
Measuring PUO wheels and brakes:
Above 20 inch wheel with red PUO caliper.
Above: 20 inch wheel barrel inner diameter near plane of rotor I measured as 469 mm. Made multiple measurements. Since the measuring tape has a tab at 0, I started all measurements at the 10 cm = 100 mm line, so all measurements on tape should have 100 mm subtracted.
Above: Measurement set up for rotor outer diameter. (I made my measurement caliper from some Aluminum bar stock, wing nuts, and plastic shelf holders from hardware store. It worked adequately and was reasonably repeatable. I made the caliper as perpendicular to the wheels/rotors/calipers, etc., as possible when measuring and gently moved the measuring tips to just clear the thing under measurement.)
Above: PUO front rotor diameter 355 mm
Above: PUO rear rotor diameter 332 to 333 mm. (332 appears to be a standard Brembo diameter, so it could be 332.)
Above: Front caliper to wheel clearance at about 29 mm is more than an inch and therefore would probably fit 18 inch wheel. (Note that the other measurement tip was lined up with the "10" mark, but due to parallax, it looks like it doesn't. I moved the camera to have near zero parallax on the (other) measurement side.)
Above: However rear caliper to wheel clearance was less than 25 mm and therefore may not clear an 18 inch wheel. (Note that the other measurement tip was lined up with the "10" mark, but due to parallax, it looks like it doesn't. I moved the camera to have near zero parallax on the (other) measurement side.)
Analysis:
I was not able to measure the Aero wheel barrel inner diameter, but the Enkei Racing PF01 in 18 inch x 8.5 was reported as 433 mm barrel inner diameter by Tire Rack. 469 mm for 20 inch less 24 mm (x 2 for diameter) clearance of rear caliper to wheel would be an effective outer diameter to the caliper of 421 mm, which would be 11 mm smaller than the 433 and would fit at back. 469 less 29 mm (x 2 for diameter) front caliper clearance would be 411 mm, which would also be significantly smaller than 433 and would fit front.
If the Aero has a similar inner diameter, then it would fit the PUO brakes. However if the Aero inner diameter is significantly smaller, it may not fit. Still need a measurement.
Feedback from
@Mad Hungarian would be welcomed, along with measurements of the Aero inner diameter from anyone.
Measuring LR 19 inch wheels and standard brakes:
Went inside and measured 19 inch wheels, rotors, caliper on Long Range Model 3.
Factory 19
19 inch wheel barrel inner diameter 444 mm. That would be about 25 mm smaller than the barrel inner diameter of the 20 inch wheel, which seems correct.
Rear rotor diameter ~331 mm (again, could be 332 mm, a standard Brembo size)
(Did not measure front rotor, believed to be 320 mm.)
Rear caliper to 19 inch wheel clearance about 26 to 27 mm; might actually clear some 17 inch wheels.
Since the 19 inch wheel's 444 mm barrel inner diameter is much larger than the PUO caliper effective outer diameters of 421 and 411 mm,
the 19 inch wheel should fit PUO brakes.
@Sasha Anis May I ask you to please measure the radius to the outside of the caliper of the 365 mm rotor upgrade so I can confirm it won't fit the 18 inch Enkei barrel inner diameter of 433 mm?
