Challenge Gravel Grinder Pro Tire - 700 x 40 Tubeless Folding Black Handmade. Intended for all around or dirt/gravel roads this tire comes equipped with a file tread center and a knobbier shoulder tread.

File tread center pattern offers low rolling resistance on smoother terrain and increased grip when the road gets rough

Shoulder tread is more aggressive for corner confidence and additional control

The Gravel Grinder is ideal for hardpack gravel sand loose and rocky terrains