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

# radius

The radius of the wheel.

## Declaration

```swift
var radius: CGFloat { get set }
```

## Discussion

Discussion When you create a wheel from a node, its default radius is half of the largest dimension of the node’s bounding box. (A wheel is always circular, even if the content of the node representing it is not.)