---
title: wheels
framework: scenekit
role: symbol
role_heading: Instance Property
path: scenekit/scnphysicsvehicle/wheels
---

# wheels

An array of SCNPhysicsVehicleWheel objects representing the vehicle’s wheels.

## Declaration

```swift
var wheels: [SCNPhysicsVehicleWheel] { get }
```

## Discussion

Discussion You can dynamically change the suspension and traction properties of a wheel connected to the vehicle by using the corresponding SCNPhysicsVehicleWheel object or by using Key-value coding with a keypath of the form wheels[index].propertyName. For example, the following code changes the size of the first wheel attached to the vehicle, simulating a failed tire: SCNPhysicsVehicle *vehicle = [SCNPhysicsVehicle vehicleWithChassisBody:car wheels:wheels]; [vehicle setValue:@0.1 forKeyPath:@"wheels[0].radius"];

## See Also

### Working with a Vehicle’s Physical Characteristics

- [chassisBody](scenekit/scnphysicsvehicle/chassisbody.md)