The Gravel Grinder is Challenge's 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 the Challenge RACE series, they start where other tires stop - they utilize ultralight 60TPI nylon casings and superior tread compounds - to give their traditional vulcanized tires excellent ride feel and quality that is more affordable than their handmade offerings.
This Challenge TLR model is hooked rim compatible.
Features
Construction: Vulcanized
Challenge vulcanized tires take full advantage of their construction know-how and awesome tread designs – It's tough to beat the durability, good performance and low cost of vulcanized construction. They 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. Challenge's 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 the Challenge SMART compound that is adapted to the different construction of vulcanized tires
Puncture Protection: PPS
Their Puncture Protection System (PPS) is a tough, tightly-woven fabric placed between the tread and casing to increase puncture resistance.