1976 Porsche 930 — Base Model
The 1976 Porsche 930 Base Model 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.
185/70R15 (Front)
| Section width | 185 mm |
|---|---|
| Aspect ratio (sidewall height) | 70% (129.5 mm) |
| Rim diameter | 15" |
| Overall tire diameter | ~25.2" |
| Revolutions per mile | ~800 |
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215/60R15 (Rear)
| Section width | 215 mm |
|---|---|
| Aspect ratio (sidewall height) | 60% (129 mm) |
| Rim diameter | 15" |
| Overall tire diameter | ~25.2" |
| Revolutions per mile | ~802 |
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What this size means for your Porsche 930
On the 1976 Porsche 930 Base Model, the factory 185/70R15 measures about 25.2″ in overall diameter with a 129.5 mm (5.1″) sidewall, and completes roughly 800 revolutions per mile. Its 70-series aspect ratio gives a tall sidewall of the kind used on trucks, SUVs, and older passenger cars, built for cushioning and load. In tire terms it is a passenger (P-metric / Euro-metric) size.
This is a staggered setup: the front axle runs 185/70R15 and the rear runs 215/60R15. The two sizes are not interchangeable, so order each for its correct axle and don't rotate front-to-rear.
Because the 1976 Porsche 930 predates many current tire lines, confirm this size is still stocked before ordering — some vintage fitments are now served mainly by specialty and classic-car tire suppliers.
Porsche 930 tire sizes by year
- 1989 Porsche 930 205/55R16 (Front) / 245/45R16 (Rear)
- 1988 Porsche 930 205/55R16 (Front) / 245/45R16 (Rear)
- 1987 Porsche 930 205/55R16 (Front) / 245/45R16 (Rear)
- 1986 Porsche 930 205/55R16 (Front) / 245/45R16 (Rear)
- 1985 Porsche 930 205/55R16 (Front) / 225/50R16 (Rear)
- 1984 Porsche 930 205/55R16 (Front) / 225/50R16 (Rear)
- 1983 Porsche 930 205/55R16 (Front) / 225/50R16 (Rear)
- 1982 Porsche 930 205/55R16 (Front) / 225/50R16 (Rear)
- 1981 Porsche 930 205/55R16 (Front) / 225/50R16 (Rear)
- 1980 Porsche 930 205/55R16 (Front) / 225/50R16 (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.