---
title: axle
framework: scenekit
role: symbol
role_heading: Instance Property
path: scenekit/scnphysicsvehiclewheel/axle
---

# axle

The direction of the axis that the wheel spins around to move the vehicle.

## Declaration

```swift
var axle: SCNVector3 { get set }
```

## Discussion

Discussion This vector is expressed in the coordinate space of the node containing the vehicle’s chassis. The default axle direction is {-1.0, 0.0, 0.0}.

## See Also

### Managing a Wheel’s Connection to a Vehicle

- [connectionPosition](scenekit/scnphysicsvehiclewheel/connectionposition.md)
- [steeringAxis](scenekit/scnphysicsvehiclewheel/steeringaxis.md)