700c, 27-Inch & 650c

- MXP is the airport code for Milan, Italy, a World Cup venue that calls for an all-conditions tire that excels in loose dirt, sand, moderate mud, hard pack, snow, grass, and pavement - Tubular version features a durable rubber coating to prevent deterioration from water, mud, and dirt - Based on the classic Grifo, with updated central chevrons to allow the tread to flex, and more aggressive side knobs - Weight: 366 grams

Boston, the original hotbed of North American 'cross and home to some of the nastiest courses. If you're flying into Boston's Logan airport, you better be ready for rain, roots and mud. The BOS, even more aggressive than the PDX, has buttressed side knobs for outstanding traction in super muddy corners and off-cambers, plus center tread that's all bite when it comes down to a tractor pull. - Clincher size: 33 x 700 - Weight: 397 grams tubeless ready - Tractor style tread for the harshest mud - Buttressed side knobs for excellent corning traction - Tubeless ready with proprietary tubeless casing - 120 TPI folding lightweight and aggressive