2004 Porsche 911 — Carrera 4S Cabriolet
The 2004 Porsche 911 Carrera 4S Cabriolet 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
| Section width | 225 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (90 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~25.1" |
| Revolutions per mile | ~804 |
- Check 225/40R18 price at TireRack
- Check 225/40R18 price at SimpleTire
- Check 225/40R18 price at Priority Tire
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295/30R18
| Section width | 295 mm |
|---|---|
| Aspect ratio (sidewall height) | 30% (88.5 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~25" |
| Revolutions per mile | ~808 |
- Check 295/30R18 price at TireRack
- Check 295/30R18 price at SimpleTire
- Check 295/30R18 price at Priority Tire
Some links on this page are affiliate links — see our disclosure.
Other 2004 Porsche 911 trims
- Carrera 4 Cabriolet 205/50R17 / 255/40R17 / 225/40R18 / 285/30R18
- Carrera 4S Coupe 225/40R18 / 295/30R18
- Carrera Cabriolet 205/50R17 / 255/40R17 / 225/40R18 / 285/30R18
- Carrera Coupe 205/50R17 / 255/40R17 / 225/40R18 / 285/30R18
- Carrera Turbo Cabriolet 225/40R18 / 295/30R18
- Carrera Turbo Coupe 225/40R18 / 295/30R18
- GT2 235/40R18 / 315/30R18
- GT3 235/40R18 / 295/30R18
- Targa 205/50R17 / 255/40R17 / 225/40R18 / 285/30R18
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.