2025 Mini Cooper — Convertible
The 2025 Mini Cooper Convertible shipped with 2 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.
215/45R17
| Section width | 215 mm |
|---|---|
| Aspect ratio (sidewall height) | 45% (96.8 mm) |
| Rim diameter | 17" |
| Overall tire diameter | ~24.6" |
| Revolutions per mile | ~819 |
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215/40R18
| Section width | 215 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (86 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~24.8" |
| Revolutions per mile | ~814 |
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What this size means for your Mini Cooper
On the 2025 Mini Cooper Convertible, the factory 215/45R17 measures about 24.6″ in overall diameter with a 96.8 mm (3.8″) sidewall, and completes roughly 819 revolutions per mile. Its 45-series aspect ratio gives a low-profile sidewall tuned for sharper handling, common on sport trims and larger-wheel packages. In tire terms it is a passenger (P-metric / Euro-metric) size.
The 215/45R17 and 215/40R18 roll within 0.2″ (0.8%) 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 2025 Mini Cooper trims
- Hardtop 2 Door 215/45R17 / 215/40R18
- Hardtop 4 Door 215/45R17 / 215/40R18
- John Cooper Works Convertible 215/45R17 / 215/40R18
- John Cooper Works Hardtop 215/45R17 / 215/40R18
- S Convertible 215/45R17 / 215/40R18
- S Hardtop 2 Door 215/45R17 / 215/40R18
- S Hardtop 4 Door 215/45R17 / 215/40R18
Mini Cooper tire sizes by year
- 2026 Mini Cooper 215/45R17 / 215/40R18
- 2024 Mini Cooper 175/65R15 / 195/55R16 / 205/45R17
- 2023 Mini Cooper 175/65R15 / 195/55R16 / 205/45R17
- 2022 Mini Cooper 175/65R15 / 195/55R16 / 205/45R17
- 2021 Mini Cooper 205/55R16 / 225/45R17 / 225/40R18
- 2020 Mini Cooper 205/55R16 / 225/45R17 / 225/40R18
- 2019 Mini Cooper 205/55R16 / 225/45R17 / 225/40R18
- 2018 Mini Cooper 205/55R16 / 225/45R17 / 225/40R18
- 2017 Mini Cooper 205/55R16 / 225/45R17 / 225/40R18
- 2016 Mini Cooper 205/55R16 / 225/45R17 / 225/40R18
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.