SUSPENSION · WHEEL ALIGNMENT
Bentley Flying Spur: looking beyond toe adjustment
A luxury saloon needs more than matching toe readings. On this Flying Spur, we also adjusted the front subframe position to reduce the left-to-right camber and caster differences.
Vehicle: 2021 Bentley Flying Spur · 64,024 km
Findings: unequal front alignment readings and high road-force readings on some tyre assemblies
Work: ride-height tightening, subframe adjustment, four-wheel alignment and tyre checks
Result: smaller front cross-camber and cross-caster differences; caster readings remain above the displayed reference range
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Where should a Flying Spur suspension check begin?
The front toe readings were −0.6 mm on the left and 3.0 mm on the right. Front camber differed by 0.50°, and caster by 0.36°. Adjusting the track rods alone would not address all of those differences.
We checked the alignment procedure for this chassis and included the front subframe position in the work. The aim was to improve the relationship between the two sides, as well as the direction of each wheel.
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Set the suspension at its working height
Bonded rubber bushes flex as the suspension moves. Tightening their fasteners with the suspension hanging can leave the rubber twisted when the vehicle returns to its normal height.
Ride-height tightening addresses that assembly condition. We worked through the relevant suspension connections and then adjusted the subframe and alignment. It is the position of the suspension when tightened that matters, not simply how tightly a bolt is secured.
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The front readings became more balanced
Front toe finished at 1.1 / 1.1 mm. The left-to-right camber difference fell from 0.50° to 0.14°, and the caster difference from 0.36° to 0.06°.
The final caster readings, 7.56° and 7.62°, still exceed the screen’s upper reference of 7.50°. The original screens below retain those readings, alongside the improvements in the other measurements.
Before adjustment
Toe readings · mm
After adjustment
Toe readings · mm
Toe direction and differences are exaggerated at the same scale in both views. Green: within the displayed toe range; red: outside. Camber is shown separately in the table.
| Wheel | Toe before (mm) | After (mm) | Camber before (°) | After (°) |
|---|---|---|---|---|
| Front left | -0.6 | 1.1 | -0.90 | -0.66 |
| Front right | 3.0 | 1.1 | -0.40 | -0.52 |
| Rear left | 2.4 | 1.9 | -1.66 | -1.67 |
| Rear right | 1.5 | 1.8 | -1.56 | -1.53 |
Caster L/R: 7.63° / 7.27° → 7.56° / 7.62°. Thrust angle: 0.04° → 0.01°.
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Wheel alignment and tyre road force are separate checks
The Hunter Road Force machine applies roller load to evaluate force variation in the tyre-and-wheel assembly. Correct balance weights alone do not establish that its loaded behaviour is satisfactory.
The two screens show current assembly readings of 21.5 kg and 19.0 kg, with rim runout of 0.08 mm and 0.11 mm respectively. These are separate measurement records, not a before-and-after pair. High road force remained in these records despite tyre matching work.
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Oil service and the next inspection
The visit also included oil-service work with a MAHLE filter and BG EPR. Residue observed around the oil-filter work led to advice to bring the next oil change forward and inspect it again.
For a suspension consultation, bring any earlier alignment reports and describe when the car feels different. We use that history with the measurements to decide what needs adjustment and what needs further attention.
Work in progress
A short excerpt from the workshop recording.
Ride-height tightening explained
Related NHC video featuring an Audi S6. Korean audio.
Watch on YouTube →Questions before booking
Does ride-height tightening replace wheel alignment?
No. It sets the working position of the relevant rubber-bushed joints. Wheel alignment then checks and adjusts the wheel geometry.
Did every final measurement fall within the displayed range?
No. The front caster readings remained above the displayed upper reference, although the difference between the two sides became smaller.
Check the suspension and tyres together
If straight-line feel or vibration still concerns you after an alignment, bring your previous measurements and recent tyre or suspension work history. We will inspect the fastening conditions, adjustment range and tyre force variation, then explain the work needed.
We explain the scope and cost after inspecting the vehicle and proceed with your agreement.
Call 031-258-1617Book on Naver031-258-1617 · NHC MOTORS, Suwon · By appointment