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1991 Bentley Turbo R Wheels & Rims: Bolt Pattern, Offset & Sizes
Fitting Bentley Turbo R wheels? This page gives the 1991 Bentley Turbo R bolt pattern (5x154.94), centre bore, factory rim size and the offset range for aftermarket and forged Bentley Turbo R rims: the same spec sheet ANKUSI uses when machining forged wheels for this car.
Bentley Turbo R (1991): 5x154.94 bolt pattern, 117.6mm center bore. Factory wheels: F: 15x6.5J R: 15x6.5J. Reference fitment ranges.
Bolt Pattern5x154.94
Wheel Bolt/NutM14x1.5 Bolt
Center Bore117.6mm
Wheel Load Rating650–750 kg/wheel (Standard Passenger Car segment reference)
Caliper TypeBrembo multi-piston fixed caliper, front & rear (OEM, standard across Bentley Continental/Flying Spur lineup)
Year1991
CategoryLuxury Sedan
Data check: the bolt pattern and center bore on this page have not yet been confirmed by a second independent source. Measure your hub or ask us before ordering. How we verify
Wheel Size & Offset at a Glance
| Configuration | Wheel Size & Offset |
|---|---|
| Factory (OE) | F: 15x6.5J R: 15x6.5J |
| Flush Fitment | 17x8.0J at ET20 offset |
| Maximum Aggressive | 18x8.5J at ET15 offset |
Forged Wheel Designs for the Bentley Turbo R
Every design below is forged to order, so it can be machined to the Bentley Turbo R's 5x154.94 bolt pattern and 117.6 mm center bore, with the width and offset calculated for your setup.
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How to Read Wheel Offset & Measurements
Use these two references before ordering: the left diagram shows where each spec (PCD, center bore, offset, width and diameter) is measured on the wheel; the right diagram shows how positive, zero and negative offset shift the wheel face relative to the hub centerline.
ANKUSI Engineering Expert Advice
Most of the engineering value in a forged wheel over a cast one shows up in rotational mass, not outright strength — both can meet the same load rating, but the forged piece gets there lighter. On a sedan platform tuned for everyday balance, that weight saving is felt directly in steering response and ride quality.
The Bentley Turbo R runs a 5x154.94 bolt pattern, 117.6mm center bore, and a F: 15x6.5J wheel from the factory. Our Flush Fitment reference is 17x8.0J ET20, which tucks the tire under the fender lip on a stock-height Bentley Turbo R. Our Maximum Aggressive reference is 18x8.5J ET15 — beyond that offset, expect rubbing against the inner fender liner under compression without further trimming.
Bentley Turbo R OE Wheel Specs
The 1991 Bentley Turbo R (Luxury Sedan) uses a 5x154.94 bolt pattern with a 117.6mm center bore. Factory wheels are F: 15x6.5J R: 15x6.5J.
Why the factory spec works for most owners:
- Preserves the factory-tuned ride and steering feel
- A mainstream size for this segment, keeping tire choice wide and prices reasonable
- Leaves full clearance for the stock brakes and suspension hardware
- Keeps handling predictable and consistent in everyday conditions
ANKUSI builds these wheels — we are the forging factory, not a reseller. For the Bentley Turbo R (1991) we drill the 5x154.94 pattern and cut the centre bore to 117.6mm on our own CNC line, so the wheel hub-centres on the car with no spacer rings, in whatever diameter, width and offset you specify.
Converting these ET figures to backspacing? Use the wheel offset and backspacing calculator.
The figures on this page are part of our open wheel fitment dataset — 10,093 vehicles, free to download, CC BY 4.0.
Offset & Backspacing Reference
Backspacing is calculated as wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance):
- OE: F 15x6.5J ET20 → ~4.54″ F backspacing, R 15x6.5J ET20 → ~4.54″ R backspacing
- Flush: 17x8.0J ET20 → ~5.29″ backspacing
- Max: 18x8.5J ET15 → ~5.34″ backspacing
Want to check a different width or offset before you order? Use our Offset & Backspacing Calculator to solve the numbers yourself, or looking for your exact Bentley spec, or want a wheel built to a custom offset for your Bentley Turbo R? Contact ANKUSI with your bolt pattern and offset target and we will confirm the correct forged wheel spec for your build.
Frequently Asked Questions
What bolt pattern (PCD) does the Bentley Turbo R use?
The 1991 Bentley Turbo R uses a 5x154.94 bolt pattern.
How many lug bolts does the Bentley Turbo R use?
The Bentley Turbo R uses a 5-lug bolt pattern (5x154.94), so you need a 5-lug forged wheel to bolt straight on.
What is the center bore size on the Bentley Turbo R?
The Bentley Turbo R's center bore is 117.6mm. If an aftermarket wheel has a larger center bore than this, hub-centric rings are recommended so the wheel centers on the hub itself rather than relying on the lug bolts alone.
What size are the factory (stock) wheels on the Bentley Turbo R?
Factory wheels on the Bentley Turbo R are F: 15x6.5J R: 15x6.5J.
What is the biggest wheel size I can fit on my Bentley Turbo R without rubbing?
The most aggressive fitment we recommend without fender work is 18x8.5J at ET15 offset. Going beyond this typically causes rubbing under compression unless you roll the fenders or add camber correction.
What does a flush wheel fitment look like on the Bentley Turbo R?
For a flush look with minimal to no rubbing, we recommend 17x8.0J at ET20 offset as a starting point on a stock or mildly lowered Bentley Turbo R.
Do I need wheel spacers for my Bentley Turbo R?
No. ANKUSI forges each wheel to your exact target offset, including the flush or max specs above, so you get the correct fitment without stacking spacers. Spacers are typically only used to push out an existing OE-offset wheel without replacing it, which isn't necessary when you're ordering a custom-offset forged wheel.
How do I calculate wheel backspacing for my Bentley Turbo R?
Backspacing (in inches) = wheel width (in) ÷ 2 + offset (mm) ÷ 25.4 + 0.5 (flange allowance). For example, the flush spec above works out to roughly 5.29" of backspacing.
What's the difference between wheel offset and backspacing?
Offset is the distance in millimeters from the wheel's true centerline to its mounting face (positive offset pulls the wheel in, negative pushes it out). Backspacing is the distance in inches from the mounting face to the back edge of the wheel barrel. They describe the same fitment from two different reference points, which is why ANKUSI lists both above — some shops and tuning guides quote offset, others quote backspacing.
Can I run staggered wheels (different sizes front and rear) on my Bentley Turbo R?
The Bentley Turbo R runs the same wheel size front and rear from the factory, so staggered fitment is not required. ANKUSI can still forge a staggered set (wider rear) on request if you want a more aggressive stance.