Tire question

[Crosshairs]

Whats the widest tire that I can put on a 9 inch wheel?

I found a screaming deal on a set of 21X12X9 that would be great for me in the mud and snow, but I'm not sure if they are to wide
Thanks

The wheels are 9X9

[beastlywarrior]

get em they should work

[Crosshairs]

Thanks for the reply, but I actually went with a set of 22X11X9 that I found on eBay.