700c, 27-Inch & 650c

BOS is the airport code for Boston, Massachusetts, the original hotbed of North American ‘cross and home to some of the harshest weather and the toughest courses. If you’re pinning on a number in New England you better be ready for rain, roots, ruts and mud. And, you better have a set of Donnelly BOS tubulars in your quiver. This tire is even more aggressive than our mud-proven PDX. It features buttressed side-knobs for outstanding traction in super muddy corners and off-cambers, and a center tread pattern that is all bite when it comes down to a tractor pull. Size: - 700 x 33mm Weight: - 386 grams Type: - Tubular Part #: - D50030 Product Features: - Buttressed side-knobs for superior cornering traction. - Unique center knob pattern designed for maximum traction when you need it most. - Soft rubber compound provides extra grip and shock absorption. - Tubeless design means an airtight casing with no inner tube to puncture. - Rubber-coated sidewalls are extremely durable and prevent deterioration from water, mud and dirt. - No additional sidewall coating necessary. - All in one construction means tread will not peel away from the tubular casing. - Precision design creates a straight tire with no variances in size or alignment. - The tire and base tape are consistently straight making it easy to glue and install to your wheel. - A removable valve core allows for valve extenders installation as well as insertion of tire sealant. - Liquid sealant can be used with all Donnelly tubulars to prevent or repair typical punctures.

LAS was designed with speed in mind. Minimal tread equates to speed but secure shoulder lugs help bite when the bike is leaned in and out of corners. LAS is also the go-to for snowy, rutted, icy cyclocross course conditions, when you need as much surface contact as possible to keep your tires planted. - Diamond file center tread with progressive shoulder lugs for cornering - Tire Intended Use: Cyclocross - ISO Diameter: 622 / road / 29" - ISO Width (mm): 33mm - Labeled Size: 700 x 33 - Tire Bead: Folding - Tire Diameter: 700c - Tire Type: Tubular - Weight (oz): 13.3