Donnelly, BOS, Tire, 700x33C, Folding, Tubular, Black

* The BOS is named after the airport code for Boston, the original hotbed of North American 'cross and home to some of the nastiest courses* Even more aggressive than the PDX, it has buttressed side knobs for outstanding traction in super muddy corners and off-camber sections and a center tread that's all bite* Tractor style tread for the harshest mud