Why do my vehicle tires lose grip on slopes?

Friction Multiplier on tire too low or Lateral Slip Stiffness underset. Raise both. Suspension Smoothing Cycles helps absorb bumps.

Per-tire FrictionCurve maps slip ratio to grip. Steeper curve at low slip = better cornering. Tune visually in editor.

Substep vehicle physics?

Enable Substepping (covered in vehicle stutter article). Higher rate stabilizes tire forces, reducing oscillation.

Fix: Chaos Vehicle Tire Loose Grip On Slope

Quick answer: Tire Friction Multiplier 1.2-1.5. Lateral Slip Stiffness 5+. Suspension Smoothing Cycles 4. Enable Substepping.

Hill climb. Tires spin without traction. Default friction is balanced for flat; slopes need extra grip.

The Fix

ChaosVehicleMovementComponent → Wheels:
  Friction Multiplier:           1.3
  Lateral Slip Stiffness:        8
  Longitudinal Slip Stiffness:   8
  Suspension Smoothing Cycles:   4

Project Settings → Physics:
  Substepping:                   true
  Max Substep Delta Time:        0.0166

Friction Multiplier scales the tire's grip curve. Slip stiffnesses tune side and forward grip. Substepping stabilizes the integration.

Verifying

Vehicle climbs slope without losing grip. Cornering on flat still feels right.

“Tune friction. Substep. Climb.”

Related Issues

For Vehicle substepping, see substep. For Cloth simulate, see cloth.

Friction up. Substep. Grip.