I want the wheel to spin still whilst using this script

all my other wheels except the front two with this script on them

Code (CSharp):

1. ublic class rotate : MonoBehaviour {
2.  
3.     public float yRotation = 5f;
4.  
5.     // Use this for initialization
6.     void Start () {
7.  
8.  
9.     }
10.  
11.     // Update is called once per frame
12.     void Update () {
13.  
14.        
15.  
16.         yRotation += Input.GetAxis("Horizontal");
17.         transform.eulerAngles = new Vector3(0, 0, yRotation);
18.  
19.  
20.     }
21. }
22.  

I basically don't want it to affect the y axis mainly. I tried changing the y value to null but it won't let me do that

 

I dont really understand what you want?
Maybe this can help you
transform.eulerAngles = new Vector3(0, 0, transform.rotation.y);
or
transform.eulerAngles = new Vector3(0, 0, transform.rotation.y+RotationSpeed)

 

basically when I apply this script, the wheel physics from the rigidbody don't seem to apply anymore to it so it doesn't naturally spin. I basically wanna not specifiy a value for the y axis as it puts a lock on any spinning

note: I am talking about natural spin on the y axis, I am ONLY changing the rotation to change the direction, which is a different axis to the wheel's natural roll

 

Ah yes i got it:
Try add rotation torque. I use this for planes rotation, But you can use this for wheels too. You might have to limit the max rotation tho.
Video tutorial :https://unity3d.com/learn/tutorials/modules/beginner/physics/addtorque
or
something like

Code (CSharp):

1. public class AddTorqueExample : MonoBehaviour
2. {
3.     public float amount = 50f;
4.  
5.  
6.     void FixedUpdate ()
7.     {
8.         float h = Input.GetAxis("Horizontal") * amount * Time.deltaTime;    
9.         rigidbody.AddTorque(transform.up * h);
10.  
11.     }
12. }