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  • BOS 700 X 33 - Tubular

BOS 700 X 33 - Tubular

Size Chart


BOS is the airport code for Boston, Massachusetts, a hotbed of North American cyclocross and home to some of the harshest weather and the toughest race 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 mud slinger is even more aggressive than our race-proven PDX cyclocross tire. It features stiff, buttressed side-knobs for outstanding traction in super muddy corners and slick off-cambers. The unique center tread pattern is all bite when it comes down to a long muddy tractor pull.

700 x 33mm

386 grams


Part #:

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.