1998 Pontiac Firebird — Formula WS6
The 1998 Pontiac Firebird Formula WS6 came from the factory equipped with 275/40R17 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.
275/40R17
| Section width | 275 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (110 mm) |
| Rim diameter | 17" |
| Overall tire diameter | ~25.7" |
| Revolutions per mile | ~786 |
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What this size means for your Pontiac Firebird
On the 1998 Pontiac Firebird Formula WS6, the factory 275/40R17 measures about 25.7″ in overall diameter with a 110 mm (4.3″) sidewall, and completes roughly 786 revolutions per mile. Its 40-series aspect ratio gives a low-profile sidewall tuned for sharper handling, common on sport trims and larger-wheel packages. In tire terms it is a passenger (P-metric / Euro-metric) size.
On a vehicle of this age, the Pontiac Firebird may have been refitted with a slightly different replacement size somewhere in its life, so check the current sidewall — not just the factory spec — before buying.
Other 1998 Pontiac Firebird trims
- Base Model 215/60R16 / 235/55R16
- Convertible 215/60R16 / 235/55R16
- Firehawk 275/40R17
- Formula 245/50R16 / 275/40R17
- Trans Am 245/50R16 / 275/40R17
- Trans Am WS6 275/40R17
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
- 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
- 1992 Pontiac Firebird 215/65R15
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.