# Steering axis inclination — reference (NB1)

Canonical URL: https://miatatorque.com/spec/alignment-steering-axis-inclination-nb1/

Applicability: NB 1999–2000 (BP-4W) — Other years inferred from 1999 factory evidence.

Confidence: fsm

Steering axis inclination (reference value)
11°38′

Always confirm against your factory manual. Match every restriction and follow all stages and procedure notes. Disputed claims must not be automatically resolved. The complete record below preserves every printed unit, source claim and procedure.

```json
{
  "id": "alignment-steering-axis-inclination-nb1",
  "name": "Steering axis inclination — reference (NB1)",
  "aliases": [],
  "applies_to": [
    {
      "gen": "NB",
      "years": [
        1999,
        2000
      ],
      "engines": [
        "BP-4W"
      ],
      "note": "Other years inferred from 1999 factory evidence."
    }
  ],
  "kind": "non-torque",
  "value_text": "Steering axis inclination (reference value)\n11°38′",
  "procedure": {
    "notes": "Factory unloaded condition: fuel tank full, coolant and oil at specified levels, spare tire, jack and tools in designated positions. Use the factory measuring procedure; height is wheel center to fender brim, not ground clearance. Factory reference value. Factory procedure says adjust to the median. Ride-height left/right difference must not exceed 10 mm {0.39 in}, PDF 317. Technical table footnotes (PDF p. 340) confirm the unloaded condition and a 1°30′ maximum cross-side camber/caster difference."
  },
  "confidence": "fsm",
  "sources": [
    {
      "source": "fsm-1999",
      "page": "02–50–1; footnotes02–50–2 (PDF p. 339)",
      "as_printed": "Steering axis inclination (reference value)\n11°38′",
      "verified_years": [
        1999,
        1999
      ],
      "document": {
        "id": "fsm-1999",
        "tier": 1,
        "title": "1999 Mazda MX-5 Miata Workshop Manual",
        "covers": [
          {
            "gen": "NB",
            "years": [
              1999,
              2000
            ],
            "engines": [
              "BP-4W"
            ]
          }
        ],
        "url": "https://www.mellens.net/mazda/Mazda-Miata-1999-2001.pdf"
      }
    }
  ],
  "jobs": [],
  "system": "suspension-front",
  "component": "inventory-pass-2026-10",
  "componentName": "Service measurements and fasteners",
  "sequence_diagrams": [],
  "url": "https://miatatorque.com/spec/alignment-steering-axis-inclination-nb1/"
}
```