1989 Geo Metro — Base Model
The 1989 Geo Metro Base Model came from the factory equipped with 145R12 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.
145R12
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Other 1989 Geo Metro trims
Geo Metro tire sizes by year
- 1997 Geo Metro 155/80R13
- 1996 Geo Metro 155/80R13
- 1995 Geo Metro 155/80R13
- 1994 Geo Metro 145R12
- 1993 Geo Metro 145R12
- 1992 Geo Metro 145R12
- 1991 Geo Metro 145R12
- 1990 Geo Metro 145R12
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.