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Roger all of the above pointers. And yes, let's see some pictures of the unit. Especially after the modification.Cant remember.. mule run 1100x18? If so a 12.5/80x18 would fit the wheel probably be close in size but lots more traction. Why wider? Driving on lawn? Extreme off roading? Post a pic of tire and wheel
Sorry my guess was wrong I was thinking goats... from pics they look like 10-12" wheels. Are they bolt together? Looks like bigger od is not an option just width.