2012 BMW 328i — Cabriolet Sport Package
The 2012 BMW 328i Cabriolet Sport Package 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.
225/40R18 (Front)
| Section width | 225 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (90 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~25.1" |
| Revolutions per mile | ~804 |
Compare prices at:
255/35R18 (Rear)
| Section width | 255 mm |
|---|---|
| Aspect ratio (sidewall height) | 35% (89.3 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~25" |
| Revolutions per mile | ~806 |
Compare prices at:
What this size means for your BMW 328i
On the 2012 BMW 328i Cabriolet Sport Package, the factory 225/40R18 measures about 25.1″ in overall diameter with a 90 mm (3.5″) sidewall, and completes roughly 804 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 225/40R18 and the rear runs 255/35R18. The two sizes are not interchangeable, so order each for its correct axle and don't rotate front-to-rear.
Other 2012 BMW 328i trims
- Cabriolet Base Model 225/45R17
- Cabriolet M Sport Package 225/40R18 (Front) / 255/35R18 (Rear) / 225/35R19 (Front) / 255/30R19 (Rear)
- Coupe Base Model 225/45R17
- Coupe M Sport Package 225/40R18 (Front) / 255/35R18 (Rear) / 225/35R19 (Front) / 255/30R19 (Rear)
- Coupe Sport Package 225/40R18 (Front) / 255/35R18 (Rear)
- Sedan Base Model 225/50R17 / 225/45R18
- Sedan Luxury Line 225/45R18
- Sedan Modern Line 225/45R18
- Sedan Performance Brakes 225/45R18
- Sedan Sport Line 225/45R18
- Sports Wagon Base Model 205/55R16 / 225/45R17 (Front) / 255/40R17 (Rear)
- Sports Wagon M Sport Package 225/45R17 (Front) / 255/40R17 (Rear)
- Sports Wagon Sport Package 225/45R17 (Front) / 255/40R17 (Rear)
- xDrive Coupe Base Model 225/45R17
- xDrive Coupe M Sport Package 225/40R18 (Front) / 255/35R18 (Rear)
- xDrive Coupe Sport Package 225/45R17 / 225/40R18 (Front) / 255/35R18 (Rear)
- xDrive Sports Wagon Base Model 205/55R16 / 225/45R17
- xDrive Sports Wagon M Sport Package 225/45R17 (Front) / 255/40R17 (Rear)
- xDrive Sports Wagon Sport Package 225/45R17 / 225/45R17 (Front) / 255/40R17 (Rear)
- xDrive Sports Wagon Sport Package Staggered Tires 225/45R17 (Front) / 255/40R17 (Rear)
BMW 328i tire sizes by year
- 2016 BMW 328i 225/50R17 / 225/45R18 / 225/45R18 (Front) / 255/40R18 (Rear)
- 2015 BMW 328i 225/50R17
- 2014 BMW 328i 225/50R17
- 2013 BMW 328i 225/45R17
- 2011 BMW 328i 225/45R17
- 2010 BMW 328i 225/45R17
- 2009 BMW 328i 225/45R17
- 2008 BMW 328i 225/45R17
- 2007 BMW 328i 225/45R17
- 2006 BMW 328i 205/55R16
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.