The radius of the wheel, measured in local space.

	collider.radius = 0.5;

using UnityEngine;
using System.Collections;

public class Example : MonoBehaviour {
    void Example() {
        collider.radius = 0.5F;
    }
}

import UnityEngine
import System.Collections

public class Example(MonoBehaviour):

	def Example() as void:
		collider.radius = 0.5F