Looks like a 6.50" - 7.00" width, I think it'll be fine with 10.00-20. I'm running 10R-22.5's on my original wheels and they don't bulge, they look correct.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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