Surly's Knard is a 29 x 3-inch wide tire with the perfect tread for maximum traction plus low rolling resistance. It's designed for Surly's 50mm-wide Rabbit Hole rim (sold separately), and it will also play nice on rims down to about 35mm wide. But, your frame must have the clearance, Clarence.
Requires a compatible frame
Size: 29 x 3-inch