Rear Wheel Geometry
This check procedure must be carried out after each operation on the mechanical components of the rear suspension since its purpose is to define the position of the wheels in relation to the body (e.g.: control arms, struts, shock absorbers, springs etc.).
The wheel geometry/angle checks must be carried out using appropriate optical equipment after checking and adjusting tire inflation pressure to the prescribed values and ensuring that the car complies with one of the following load conditions:
- Standard 0 - vehicle empty including spare wheel, tools, accessories and consumables with 5 litres of fuel.
- "Standard A" - vehicle empty including spare wheel, tools, accessories and consumables (full tank of fuel).
Geometry check
Check that the geometry of the rear wheels is within prescribed values; to measure the geometry, check the distance from the ground to the maximum point of curvature on the rear wing (protrusion).
| Size | Value |
| Rear geometry - Alloy rims: front 17" / rear 18" (mm) Coupe | 690 (Standard 0) |
| Rear geometry - Alloy rims: front 17" / rear 18" (mm) Spider | 685 (Standard 0) |
| Rear geometry - Alloy rims: front 17" / rear 18" (mm) Coupe | 684 (Standard A) |
| Rear geometry - Alloy rims: front 17" / rear 18" (mm) Spider | 679 (Standard A) |
| Rear geometry - Alloy rims: front 18" / rear 19" (mm) Coupe | 689 (Standard 0) |
| Rear geometry - Alloy rims: front 18" / rear 19" (mm) Spider | 686 (Standard 0) |
| Rear geometry - Alloy rims: front 18" / rear 19" (mm) Coupe | 684 (Standard A) |
| Rear geometry - Alloy rims: front 18" / rear 19" (mm) Spider | 681 (Standard A) |
Rear toe-in check
Check that the rear wheel toe-in is within required limits.
| Size | Value |
| Rear wheel toe-in | .67° (Standard 0) ±.13° |
| Rear wheel toe-in | .67° (Standard A) ±.13° |
Loosen the lock nuts (1a) (1b) and adjust the threaded spacer (1c) for the toe-in adjustment rod in order to comply with the prescribed limits.
After adjustment, tighten the lock nuts.
Camber check
Camber adjustments must be followed by a toe-in angle check.
Check that the rear wheel camber is within the prescribed limits.
| Size | Value |
| Rear wheel camber | -1.7° (Standard 0) ±.25° |
| Rear wheel camber | -1.75° (Standard A) ±.25° |
In order to comply with the prescribed limits, loosen the upper fixing nut (1) for the rear shock absorber/spring unit.
After adjustment, tighten the upper fixing nut for the rear shock absorber/spring unit, making sure that the eccentric washers (1a) (1b) are fitted correctly inside the shoulders.
| Component | Fixing | Dia | Value (Nm) |
| Shock absorber (upper fastening) | Nut | M14x2 | 180 |