Challenge Gravel Grinder Race - Clincher

The Gravel Grinder is our original and often-imitated fast gravel design. It combines a speedy diamond center for low rolling resistance with aggressive shoulder knobs that reliably hook-up when the terrain gets soft, muddy or a bit sketchy. 

With our RACE series, we start where other tires stop - we utilize ultralight 60TPI nylon casings and superior tread compounds - to give our traditional vulcanized tires excellent ride feel and quality that is more affordable than our handmade offerings.

Challenge clincher tires are designed for use with tubes and hooked rims.

CONSTRUCTION: Vulcanized
Challenge vulcanized tires take full advantage of our construction know-how and awesome tread designs – It's tough to beat the durability, good performance and low cost of vulcanized construction. We work with proven factories to bring iconic Challenge models to more riders.

SERIES: RACE (Vulcanized)
Value and Performance – It's tough to beat the durability, good performance and low cost of vulcanized construction. Our RACE series brings iconic Challenge tread patterns and compounds to more riders.

CASING: Nylon Superlight 60TPI
Vulcanized Nylon tire casings are the industry standard. Easy to produce and offering excellent durability and high performance at a moderate cost, they are the most common variety of tire available.

COMPOUND: SMART-V
A specially formulated version of our SMART compound that is adapted to the different construction of vulcanized tires.

PUNCTURE PROTECTION: PPS
Our Puncture Protection System (PPS) is a tough, tightly-woven fabric placed between the tread and casing to increase puncture resistance.