1989 Cadillac Allante — Base Model
The 1989 Cadillac Allante Base Model came from the factory equipped with 225/55R16 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.
225/55R16
| Section width | 225 mm |
|---|---|
| Aspect ratio (sidewall height) | 55% (123.8 mm) |
| Rim diameter | 16" |
| Overall tire diameter | ~25.7" |
| Revolutions per mile | ~783 |
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What this size means for your Cadillac Allante
On the 1989 Cadillac Allante Base Model, the factory 225/55R16 measures about 25.7″ in overall diameter with a 123.8 mm (4.9″) sidewall, and completes roughly 783 revolutions per mile. Its 55-series aspect ratio gives a balanced everyday-passenger profile — enough sidewall to soak up road shock while keeping steering response crisp. In tire terms it is a passenger (P-metric / Euro-metric) size.
Because the 1989 Cadillac Allante 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.
Cadillac Allante tire sizes by year
- 1993 Cadillac Allante 225/60R16
- 1992 Cadillac Allante 225/55R16
- 1991 Cadillac Allante 225/55R16
- 1990 Cadillac Allante 225/55R16
- 1988 Cadillac Allante 225/60R15
- 1987 Cadillac Allante 225/60R15
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.