1991 Pontiac Firebird — Trans Am
The 1991 Pontiac Firebird Trans Am 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.
215/60R16
| Section width | 215 mm |
|---|---|
| Aspect ratio (sidewall height) | 60% (129 mm) |
| Rim diameter | 16" |
| Overall tire diameter | ~26.2" |
| Revolutions per mile | ~771 |
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245/50R16
| Section width | 245 mm |
|---|---|
| Aspect ratio (sidewall height) | 50% (122.5 mm) |
| Rim diameter | 16" |
| Overall tire diameter | ~25.6" |
| Revolutions per mile | ~786 |
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What this size means for your Pontiac Firebird
On the 1991 Pontiac Firebird Trans Am, the factory 215/60R16 measures about 26.2″ in overall diameter with a 129 mm (5.1″) sidewall, and completes roughly 771 revolutions per mile. Its 60-series aspect ratio gives a taller, comfort-biased sidewall that favors ride quality and shrugs off rough pavement. In tire terms it is a passenger (P-metric / Euro-metric) size.
The 215/60R16 and 245/50R16 differ in both width and overall diameter (0.6″, 2.3%), which usually means a staggered front/rear setup — the two sizes are not interchangeable side to side, so match each to its correct axle.
Because the 1991 Pontiac Firebird 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 1991 Pontiac Firebird trims
- Base Model 215/65R15
- Formula 245/50R16
- Trans Am GTA 245/50R16
Pontiac Firebird tire sizes by year
- 2002 Pontiac Firebird 235/55R16
- 2001 Pontiac Firebird 215/60R16 / 235/55R16
- 2000 Pontiac Firebird 215/60R16 / 235/55R16
- 1999 Pontiac Firebird 215/60R16 / 235/55R16
- 1998 Pontiac Firebird 215/60R16 / 235/55R16
- 1997 Pontiac Firebird 215/60R16 / 235/55R16
- 1996 Pontiac Firebird 215/60R16 / 235/55R16
- 1995 Pontiac Firebird 215/60R16 / 235/55R16
- 1994 Pontiac Firebird 215/60R16 / 235/55R16
- 1993 Pontiac Firebird 215/60R16 / 235/55R16
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.