# VehicleTyres

> Talos next · Since 0.6

## Fields

| Field | Type | Required | Default | Allowed values | Description |
|---|---|---|---|---|---|
| `model` | `VehicleTyreModel` | no |  | `clamp`, `curve` |  |
| `peakSlipRatio` | `number` | no |  |  | Longitudinal slip ratio at peak grip, dimensionless and greater than zero; 0.08 to 0.20 covers most road tyres. Ignored by the `clamp` tyre model, which has no curve to place a peak on. |
| `peakSlipAngle` | `number` | no |  |  | Slip angle at peak lateral grip, in RADIANS — not degrees — and greater than zero; 0.10 to 0.20 rad (roughly 6° to 11°) covers most road tyres. Ignored by the `clamp` model. |
| `muLong` | `number` | no |  |  | Peak longitudinal friction coefficient, dimensionless and greater than zero. About 1.0 for a road tyre on dry asphalt, 0.7 wet, 0.3 on gravel. |
| `muLat` | `number` | no |  |  | Peak lateral friction coefficient, dimensionless and greater than zero. Usually a little below muLong on a road tyre. |
| `loadSensitivity` | `number` | no |  |  | How much grip falls away as vertical load rises, 0..1. 0 makes friction load-independent, the textbook idealisation; raising it is what stops a heavy vehicle cornering as if it were light, and it is why a loaded axle gives less grip than two lightly loaded ones. Ignored by the `clamp` model. |
| `rollingResistance` | `number` | no | `0` |  | Rolling resistance coefficient, dimensionless and zero or more: the retarding force is this times the wheel's vertical load, which is what stops a vehicle coasting for ever on a flat road. About 0.010 for a car tyre on asphalt, 0.015 for a heavier one, 0.05 and up on soft ground. Defaults to 0.014. |

## See also

- `VehicleTyreModel`