For originality it's 15" but the rubber is a fortune these days. I've got 345*35*15s on the rear and 225*50*15 on the from of my Hawk on Gerrys coffin spoke wheels. Craig does similar but I think he has 16" or 17" (or both?) in the coffin spoke style. The tyre options for these rims is bigger. Of course, there's nothing that forces you to go for coffin spokes - whatever you like the look of really! There were other styles in period on the originals too.
Guy
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