2011 BMW 328i — Cabriolet Base Model
The 2011 BMW 328i Cabriolet Base Model came from the factory equipped with 225/45R17 tires. If your vehicle has since been fitted with aftermarket or upsized wheels, your actual tire size may no longer match this factory spec — always confirm against your door placard before buying.
225/45R17
| Section width | 225 mm |
|---|---|
| Aspect ratio (sidewall height) | 45% (101.3 mm) |
| Rim diameter | 17" |
| Overall tire diameter | ~25" |
| Revolutions per mile | ~808 |
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Other 2011 BMW 328i trims
- Cabriolet M Sport Package 225/40R18 (front)255/35R18 (rear) / 225/35R19 (front)255/30R19 (rear)
- Cabriolet Sport Package 225/40R18 front / 255/35R18 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 205/55R16 / 225/45R17 (front)255/40R17 (rear)
- Sedan M Sport Package 225/45R17 front / 255/40R17 rear
- Sedan Sport Package 225/45R17 front / 255/40R17 rear
- 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 Sedan Base Model 205/55R16
- xDrive Sedan M Sport Package 225/45R17 front / 255/40R17 rear
- xDrive Sedan Sport Package 225/45R17 / 225/45R17 (front)255/40R17 (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)
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.