2023 Mini Countryman — John Cooper Works ALL4

The 2023 Mini Countryman John Cooper Works ALL4 came from the factory equipped with 225/50R18 tires. If your vehicle has since been fitted with aftermarket or upsized wheels, your actual tire size may no longer match this factory spec — always confirm against your door placard before buying.

225/50R18

Section width225 mm
Aspect ratio (sidewall height)50% (112.5 mm)
Rim diameter18"
Overall tire diameter~26.9"
Revolutions per mile~751

Compare prices at:

What this size means for your Mini Countryman

On the 2023 Mini Countryman John Cooper Works ALL4, the factory 225/50R18 measures about 26.9″ in overall diameter with a 112.5 mm (4.4″) sidewall, and completes roughly 751 revolutions per mile. Its 50-series aspect ratio gives a balanced everyday-passenger profile — enough sidewall to soak up road shock while keeping steering response crisp. In tire terms it is a passenger (P-metric / Euro-metric) size.

Other 2023 Mini Countryman trims

Mini Countryman tire sizes by year

See every Mini Countryman year & trim →

How to read a tire size

A tire size like 225/45R17 breaks down into three parts: the first number is the section width in millimeters (the tire's width from sidewall to sidewall), the second is the aspect ratio — the sidewall's height as a percentage of that width — and the number after the "R" is the rim diameter in inches. A letter prefix (P or LT) indicates Passenger or Light Truck construction; its absence usually means Euro-metric sizing.

Some trucks and off-road tires instead use "flotation" sizing, like 37X12.50R17 — here the numbers are the tire's overall diameter and width in inches directly, with the rim diameter last.

Always verify against the tire information placard on your driver's-side door jamb or your owner's manual before purchasing — tire size can vary by factory option package even within the same trim.