1991 Cadillac Eldorado — Biarritz
The 1991 Cadillac Eldorado Biarritz 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.
205/70R15
| Section width | 205 mm |
|---|---|
| Aspect ratio (sidewall height) | 70% (143.5 mm) |
| Rim diameter | 15" |
| Overall tire diameter | ~26.3" |
| Revolutions per mile | ~767 |
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215/65R15
| Section width | 215 mm |
|---|---|
| Aspect ratio (sidewall height) | 65% (139.8 mm) |
| Rim diameter | 15" |
| Overall tire diameter | ~26" |
| Revolutions per mile | ~776 |
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What this size means for your Cadillac Eldorado
On the 1991 Cadillac Eldorado Biarritz, the factory 205/70R15 measures about 26.3″ in overall diameter with a 143.5 mm (5.6″) sidewall, and completes roughly 767 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 passenger (P-metric / Euro-metric) size.
The 205/70R15 and 215/65R15 roll within 0.3″ (1.2%) of each other in overall diameter, so they are interchangeable from a speedometer standpoint — the second size is an optional wheel package rather than a different rolling size.
Because the 1991 Cadillac Eldorado 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 Cadillac Eldorado trims
- Base Model 205/70R15 / 215/65R15
- Spring Edition 205/70R15 / 215/65R15
- Touring Coupe 215/60R16
Cadillac Eldorado tire sizes by year
- 2002 Cadillac Eldorado 225/60R16
- 2001 Cadillac Eldorado 225/60R16
- 2000 Cadillac Eldorado 225/60R16
- 1999 Cadillac Eldorado 225/60R16
- 1998 Cadillac Eldorado 225/60R16
- 1997 Cadillac Eldorado 225/60R16
- 1996 Cadillac Eldorado 225/60R16
- 1995 Cadillac Eldorado 225/60R16
- 1994 Cadillac Eldorado 225/60R16
- 1993 Cadillac Eldorado 225/60R16
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.