Photo property of Questar: https://secure.questar1.com/catalog/QD3214.html Here we have a picture showing a six spoke wheel that the shape was determined using a metal detector.

Photo property of Questar: https://secure.questar1.com/catalog/QD3214.html Here is a picture from a wall outside that was used between the 18th and 19th dynasty. The chariot shown has a six spoke wheel.