1985 Pontiac Fiero — Sport
The 1985 Pontiac Fiero Sport came from the factory equipped with 185/80R13 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.
185/80R13
| Section width | 185 mm |
|---|---|
| Aspect ratio (sidewall height) | 80% (148 mm) |
| Rim diameter | 13" |
| Overall tire diameter | ~24.7" |
| Revolutions per mile | ~818 |
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What this size means for your Pontiac Fiero
On the 1985 Pontiac Fiero Sport, the factory 185/80R13 measures about 24.7″ in overall diameter with a 148 mm (5.8″) sidewall, and completes roughly 818 revolutions per mile. Its 80-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 small-diameter fitment typical of older or economy vehicles.
Because the 1985 Pontiac Fiero 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.
Other 1985 Pontiac Fiero trims
- Base Model 185/80R13
- GT 215/60R14
- SE 195/70R14
Pontiac Fiero tire sizes by year
- 1988 Pontiac Fiero 185/75R14 / 195/70R14
- 1987 Pontiac Fiero 185/75R14 / 195/70R14
- 1986 Pontiac Fiero 185/75R14 / 195/70R14
- 1984 Pontiac Fiero 185/80R13
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.