I replaced 4.10 / 3.50 - 6 turf tires with 13 x 5 x 6 snow hogs and they seem great. A lot of people say they like the X-Trac type better. I prefer the look of the X-Trac design, but they were more expensive and harder to find. They are more flat / square and have more lugs on them. I have also heard they are less bouncy than the snow hogs, but mine seem fine. I feel the bounce when trying to bounce them, but not during normal use.
There are 2 different sizing methods on small tires.
4.10 / 3.50 - 6 = 4.1" tall sidewall, 3.5" wide, 6" rim.
13 x 5 x 6 = 13" diameter, 5" wide, 6" rim.
Just take a tape measure and measure your diameter, my guess is probably around 15". Wider would probably help a little as long as it won't rub the chassis or stick out past the bucket. Just make sure the rim size is the same and the total diameter is close.
Here are some pictures of mine for comparison. Hopefully Trouts2 doesn't see this thread :)
This message was modified Feb 3, 2011 by Shryp