Heads up racing

[scatesracing]

My local track over the last couple of years has put together a couple heads up streetcar events... Typical stuff like 20 mile cruise, windows roll up and down, all glass , mufflers and insured.
The tire rule is killing me though. the rule reads • No Back halved, Tubbed or Mini Tubbed vehicle allowed So if you can fit it within your stock fender wells and it has a D.O.T. stamp on it your good...... even if i run a tire that fits into the stock fender well im tubbed so my truck is put into the outlaw class.....SOOOO Im thinking of putting the tubs back stock... The rule dosent say anything about the rearend being narrowed. get some wheels with the right offset and go racing.... Now to my question. what is the biggest tire we can fit in the stock fender well. the key word is "in" Im not putting a straight axle in the front.. LOL