1986 Pontiac Sunbird — Base Model
The 1986 Pontiac Sunbird 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.
175/80R13
| Section width | 175 mm |
|---|---|
| Aspect ratio (sidewall height) | 80% (140 mm) |
| Rim diameter | 13" |
| Overall tire diameter | ~24" |
| Revolutions per mile | ~840 |
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195/70R13
| Section width | 195 mm |
|---|---|
| Aspect ratio (sidewall height) | 70% (136.5 mm) |
| Rim diameter | 13" |
| Overall tire diameter | ~23.7" |
| Revolutions per mile | ~849 |
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What this size means for your Pontiac Sunbird
On the 1986 Pontiac Sunbird Base Model, the factory 175/80R13 measures about 24″ in overall diameter with a 140 mm (5.5″) sidewall, and completes roughly 840 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.
The 175/80R13 and 195/70R13 roll within 0.3″ (1.3%) of each other in overall diameter, so they are interchangeable from a speedometer standpoint — the second size is an optional wheel package rather than a different rolling size.
Because the 1986 Pontiac Sunbird 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 1986 Pontiac Sunbird trims
Pontiac Sunbird tire sizes by year
- 1994 Pontiac Sunbird 185/75R14 / 195/70R14 / 195/65R15
- 1993 Pontiac Sunbird 185/75R14 / 195/70R14 / 195/65R15
- 1992 Pontiac Sunbird 185/75R14 / 195/70R14 / 195/65R15
- 1991 Pontiac Sunbird 185/75R14 / 195/70R14
- 1990 Pontiac Sunbird 185/75R14
- 1989 Pontiac Sunbird 185/80R13 / 195/70R14
- 1988 Pontiac Sunbird 185/80R13 / 195/70R14
- 1987 Pontiac Sunbird 175/80R13 / 195/70R13
- 1985 Pontiac Sunbird 175/80R13
- 1984 Pontiac Sunbird 175/80R13
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.