Surly Big Fat Larry Tires. Just like the standard Larry tire, only bigger. For those of you looking for the maximum in floatation, you’ve just found the mother lode. -Updated model with thinner casing; improved traction at low pressures and 100-200g lighter than standard 120tpi version -Excellent tire for snowy conditions or any conditions that call for lower pressure and higher float -The same dagger-type knobs found on the standard Larry tire -Measures about 4.7" when mounted to the Surly Clown Shoe 100 mm rim.