Article 4I

Rear Axles (Inboard of the contact surface with the wheel spacer) and bearings

Technical Regulations

Article 4I

FIA Source

Rear Axles (Inboard of the contact surface with the wheel spacer) and bearings

Chapter: C10.6

In Simple Terms

This rule covers the internal design of the rear axle and bearings that are hidden inside the wheel assembly. It specifies how the axle connects to the brake disc and how all the internal components must be arranged and mounted together.

  • Governs the geometry and design of rear axle components located inside the wheel spacer area
  • Covers the wheel bearing assembly and how it interfaces with the axle
  • Regulates the mounting connection between the axle and brake disc bell
  • Applies only to the inboard (interior) side of the wheel spacer contact surface
Official FIA Text

Axle geometry lying inboard of the contact surface with the wheel spacers and wheel bearing assembly. Axle geometry lying inboard of the contact surface with the wheel spacers, wheel bearings and spacers, interface and mounting to the brake disc bell,

rear axlewheel bearingswheel spacerbrake disc bellinboard geometry
2026 Season Regulations