Largest early Ford wheels?

I'm working on a speedster project, and am after some giant steelies to roll on. The axles are stock model-A. I was thinking 21" T wheels, but is there anything bigger that will bolt up?

 

1928 -1929 Model A's had 21 inch wire wheels. They were bad about not being very true though

Model A firetrucks and commercials had split rim wheels. They are bigger I think.

 

Yes, 28 - 29 Model A but watch out as the rims have a rolled edge and are badly prone to rust. I have 10 of them fitted into the fence around the house and they are all badly rusted on the rims.

 

You can buy new 19" and 21" Model A wires at Coker.