Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2018 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
STI Model
FRONT SUSPENSION SYSTEM AND WHEEL ALIGNMENT SPECIFICATION
| Tire size | 245/40R18 | 245/35R19 | |
| Wheel arch height (Tolerance: +12 mm-24 mm (+0.47 in-0.94 in )) |
mm (in) | 370 (14.57) | |
| Camber (tolerance: ±0°30' Differences between RH and LH: 30' or less) | -0°45' | ||
| Caster (referential value) | 6°33' | ||
| Steering angle (tolerance: ±1.5°) | Inner wheel | 36.3° | |
| Outer wheel | 32.0° | ||
| Toe-in | mm (in) | 0±3 (0±0.12) Toe angle (sum of both wheels): 0°±0°16' | |
| Kingpin angle (referential value) | 15°22' | ||
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.