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Wheel cut thru definitions and specs
Note the location of REAR SPACING and also OFFSET; probably two of the most important dimensions and not always understood as related to wheel size and relationship to the brake components.

For the 3, Rear Spacing is approximately 6.5 inches or 165 mm for a nominal 8" rim. Offset is 53P or 53mm Positive, which means the distance from the machined hub flat mounting surface to the rim's true centreline is 53 mm in the outboard direction. (The rim illustrated has a negative offset.)

As Positive offset increases, this means the wheel wraps around the disc brake mechanism more deeply, and hence the more the wheel would cover the brake parts. This is why most 18" wheels will not fit with the larger Brembo "supercharged engine" brake calipers.
Pitch circle diameter is 120mm; Pattern is 5 lug, and the tyre load rating is 112 with a recommended tyre speed rating of H or higher along with the XL load rating. For the 3, the stock tyre diameter is about 30 inches. The 255/60/18 or 255/55/19 OEM tyre outside diameter is 30.04 inches; Wheel lug torque is from 130 to 150 Nm or 96 to 110 lbf-ft and the lug nut hex socket size is 22mm.

Max Load High Speed Driving Tyre pressures are Front, 33 psig, (230 Kpa) and Rear, 42 psig, (290 Kpa).

The OEM rims are rated at 940 kgs, the highest that LR makes, hence while rims from other Land Rover products may physically fit, the odds are they are under rated in a weight sense.
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