2013 BMW 640i — Convertible M Sport Package
The 2013 BMW 640i Convertible M Sport Package shipped with 4 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.
245/40R19 (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 |
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What this size means for your BMW 640i
On the 2013 BMW 640i Convertible M Sport Package, the factory 245/40R19 measures about 26.7″ in overall diameter with a 98 mm (3.9″) sidewall, and completes roughly 755 revolutions per mile. Its 40-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 245/40R19 and the rear runs 275/35R19. The two sizes are not interchangeable, so order each for its correct axle and don't rotate front-to-rear.
Other 2013 BMW 640i trims
- Convertible Base Model 245/45R18 / 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
- Coupe Base Model 245/45R18 / 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
- Coupe M Sport Package 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
- Gran Coupe Base Model 245/45R18 / 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
- Gran Coupe M Sport Package 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
BMW 640i tire sizes by year
- 2019 BMW 640i 245/45R18 / 245/40R19
- 2018 BMW 640i 245/45R18 / 245/40R19
- 2017 BMW 640i 245/45R18 / 245/40R19
- 2016 BMW 640i 245/45R18 / 245/40R19
- 2015 BMW 640i 245/45R18 / 245/40R19
- 2014 BMW 640i 245/45R18 / 245/40R19 / 245/40R19 (Front) / 275/35R19 (Rear) / 245/35R20 (Front) / 275/30R20 (Rear)
- 2012 BMW 640i 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.