TUFO Flexus Primus 33 SG Cyclocross Tubular Tire, 700c x 33

Top-Level Cyclocross Tubular for Most Conditions

The Flexus Primus 33 SG is TUFO's top cyclocross tubular for everything short of deep mud. A self-cleaning tread keeps finding grip, and dedicated side knobs hold steady in corners.

A soft tread compound helps soak up bumps on rough courses. Tubulars are sewn-up tires that glue or tape onto a dedicated tubular rim, so check your wheels before you buy. Whether you're racing on grass, dirt or mixed courses, this is a tire you can leave on all season.

TUFO was founded in the Czech Republic in 1991 by former racer Miloslav Klabal, who built his first tubular in a garden shed. In 1993 TUFO patented the tubular clincher, and today it still makes its tires in its own factories in Otrokovice and Zlín.