Hey Ryan - Welcome!
Run a search above - go to advanced - I rec searching 'titles only' for whatever you can think of as it will yield crazy awesome results!
To answer your question... 31x10.5x15 is a standard size. 31 inch tire, 10.5 wide tread, 15 inch rim/wheel.
Wrascal Carrier: The Most Versatile Bag in the World.
Transforming into six different configurations quickly and easily, the Carrier will fit in with any mudding, rock-crawling, hunting, gear hauling, camping, hiking, biking, or catching a flight. Regardless of where you are in the world the Wrascal Carrier is ready for any adventure.