1991 Ford Aerostar — Base Model
The 1991 Ford Aerostar Base Model came from the factory equipped with 215/70R14 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.
215/70R14
| Section width | 215 mm |
|---|---|
| Aspect ratio (sidewall height) | 70% (150.5 mm) |
| Rim diameter | 14" |
| Overall tire diameter | ~25.9" |
| Revolutions per mile | ~780 |
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What this size means for your Ford Aerostar
On the 1991 Ford Aerostar Base Model, the factory 215/70R14 measures about 25.9″ in overall diameter with a 150.5 mm (5.9″) sidewall, and completes roughly 780 revolutions per mile. Its 70-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.
Because the 1991 Ford Aerostar 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.
Ford Aerostar tire sizes by year
- 1997 Ford Aerostar 215/70R14 / 215/75R14
- 1996 Ford Aerostar 215/70R14 / 215/75R14
- 1995 Ford Aerostar 215/70R14 / 215/75R14
- 1994 Ford Aerostar 215/70R14 / 215/75R14
- 1993 Ford Aerostar 215/70R14 / 215/75R14
- 1992 Ford Aerostar 215/70R14 / 215/75R14
- 1990 Ford Aerostar 215/70R14
- 1989 Ford Aerostar 215/70R14
- 1988 Ford Aerostar 215/70R14
- 1987 Ford Aerostar 215/70R14
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.