2022 BMW 840i — Convertible
The 2022 BMW 840i Convertible shipped with 6 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.
245/45R18 (Front)
| Section width | 245 mm |
|---|---|
| Aspect ratio (sidewall height) | 45% (110.3 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~26.7" |
| Revolutions per mile | ~756 |
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275/40R18 (Rear)
| Section width | 275 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (110 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~26.7" |
| Revolutions per mile | ~756 |
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245/40R19 (Front)
| Section width | 245 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (98 mm) |
| Rim diameter | 19" |
| Overall tire diameter | ~26.7" |
| Revolutions per mile | ~755 |
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275/35R19 (Rear)
| Section width | 275 mm |
|---|---|
| Aspect ratio (sidewall height) | 35% (96.3 mm) |
| Rim diameter | 19" |
| Overall tire diameter | ~26.6" |
| Revolutions per mile | ~759 |
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245/35R20 (Front)
| Section width | 245 mm |
|---|---|
| Aspect ratio (sidewall height) | 35% (85.8 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~26.8" |
| Revolutions per mile | ~754 |
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275/30R20 (Rear)
| Section width | 275 mm |
|---|---|
| Aspect ratio (sidewall height) | 30% (82.5 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~26.5" |
| Revolutions per mile | ~761 |
Compare prices at:
What this size means for your BMW 840i
On the 2022 BMW 840i Convertible, the factory 245/45R18 measures about 26.7″ in overall diameter with a 110.3 mm (4.3″) sidewall, and completes roughly 756 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.
This is a staggered setup: the front axle runs 245/45R18 and the rear runs 275/40R18. The two sizes are not interchangeable, so order each for its correct axle and don't rotate front-to-rear.
Other 2022 BMW 840i trims
- Convertible M Sport 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
- Coupe 245/45R18 (Front) / 275/40R18 (Rear) / 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
- Coupe M Sport 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
- Gran Coupe 245/45R18 (Front) / 275/40R18 (Rear) / 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
- Gran Coupe M Sport 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
BMW 840i tire sizes by year
- 2026 BMW 840i 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
- 2025 BMW 840i 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
- 2024 BMW 840i 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
- 2023 BMW 840i 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
- 2021 BMW 840i 245/45R18 (Front) / 275/40R18 (Rear) / 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
- 2020 BMW 840i 245/45R18 (Front) / 275/40R18 (Rear) / 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
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.