2021 Mini Countryman — Cooper
The 2021 Mini Countryman Cooper shipped with 3 different factory tire sizes, depending on the wheel package it left the factory with (this can also reflect a staggered front/rear setup). Check your tire sidewall or door placard to confirm which one applies to your vehicle.
This trim shipped with more than one tire size (staggered fitment, front/rear, or optional wheel package). Confirm which one matches your vehicle by checking your tire sidewall or door placard.
225/55R17
| Section width | 225 mm |
|---|---|
| Aspect ratio (sidewall height) | 55% (123.8 mm) |
| Rim diameter | 17" |
| Overall tire diameter | ~26.7" |
| Revolutions per mile | ~754 |
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225/50R18
| Section width | 225 mm |
|---|---|
| Aspect ratio (sidewall height) | 50% (112.5 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~26.9" |
| Revolutions per mile | ~751 |
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225/45R19
| Section width | 225 mm |
|---|---|
| Aspect ratio (sidewall height) | 45% (101.3 mm) |
| Rim diameter | 19" |
| Overall tire diameter | ~27" |
| Revolutions per mile | ~748 |
Compare prices at:
What this size means for your Mini Countryman
On the 2021 Mini Countryman Cooper, the factory 225/55R17 measures about 26.7″ in overall diameter with a 123.8 mm (4.9″) sidewall, and completes roughly 754 revolutions per mile. Its 55-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.
The 225/55R17 and 225/50R18 roll within 0.2″ (0.7%) of each other in overall diameter, so they are interchangeable from a speedometer standpoint — the second size is an optional wheel package rather than a different rolling size.
Other 2021 Mini Countryman trims
- Cooper ALL4 225/55R17 / 225/50R18 / 225/45R19
- Cooper S 225/50R18 / 225/45R19
- Cooper S ALL4 225/50R18 / 225/45R19
- Cooper SE ALL4 225/50R18
- John Cooper Works ALL4 225/50R18 / 225/45R19
Mini Countryman tire sizes by year
- 2026 Mini Countryman 245/45R19 / 245/40R20
- 2025 Mini Countryman 245/45R19 / 245/40R20
- 2024 Mini Countryman 225/55R17 / 225/50R18 / 225/45R19
- 2023 Mini Countryman 225/55R17 / 225/50R18 / 225/45R19
- 2022 Mini Countryman 225/55R17 / 225/50R18 / 225/45R19
- 2020 Mini Countryman 225/55R17 / 225/50R18 / 225/45R19
- 2019 Mini Countryman 225/55R17 / 225/50R18 / 225/45R19
- 2018 Mini Countryman 225/55R17 / 225/50R18 / 225/45R19
- 2017 Mini Countryman 225/55R17 / 225/50R18 / 225/45R19
- 2016 Mini Countryman 205/55R17 / 225/45R18
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.