1990 Bentley Turbo R — Base Model
The 1990 Bentley Turbo R Base Model came from the factory equipped with 255/65R15 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.
255/65R15
| Section width | 255 mm |
|---|---|
| Aspect ratio (sidewall height) | 65% (165.8 mm) |
| Rim diameter | 15" |
| Overall tire diameter | ~28.1" |
| Revolutions per mile | ~719 |
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What this size means for your Bentley Turbo R
On the 1990 Bentley Turbo R Base Model, the factory 255/65R15 measures about 28.1″ in overall diameter with a 165.8 mm (6.5″) sidewall, and completes roughly 719 revolutions per mile. Its 65-series aspect ratio gives a taller, comfort-biased sidewall that favors ride quality and shrugs off rough pavement. In tire terms it is a passenger (P-metric / Euro-metric) size.
Because the 1990 Bentley Turbo R 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.
Bentley Turbo R tire sizes by year
- 1998 Bentley Turbo R 255/55R17
- 1997 Bentley Turbo R 255/55R17
- 1996 Bentley Turbo R 255/55R17
- 1995 Bentley Turbo R 255/65R15 / 255/60R16
- 1994 Bentley Turbo R 255/65R15 / 255/60R16
- 1993 Bentley Turbo R 255/65R15
- 1992 Bentley Turbo R 255/65R15
- 1991 Bentley Turbo R 255/65R15
- 1989 Bentley Turbo R 255/65R15
- 1988 Bentley Turbo R 255/65R15
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.