Challenge - GRAVEL GRINDER-RACE-V-TLR-Brown-120tpi-700x38 If you want the stiffness

If you want the stiffness and performance of a race bike without the associated twitchy handling

Made in the USA

The stays are rubberised at the contact points to help absorb the vibrations from gravel trails

MTRX bearings are filled with SKF Solid Oil technology

The polymer has a new formula enhanced for more durability and comfort

Challenge - GRAVEL GRINDER-RACE-V-TLR-Brown-120tpi-700x38 If you want the stiffnessConsumer Product Safety Bulletin March 13, 2019 Make your mark on the gravel scene with the Gravel Grinder. This tyre combines a fast rolling diamond centre with aggressive shoulder knobs that only hook up when the terrain gets soft, muddy, or a bit sketchy.