GRAVEL GRINDER Pro - Handmade Tubeless Tubular inflation/tubeless Please note Challenge Presta Valve

Please note Challenge Presta Valve Extenders are compatible with our Challenge Latex Inner Tubes and all Challenge Tubular Tires and may be required for use with deep section rims

Challenge has developed a new technology applied to handmade construction

and unmistakable Challenge style

For perfect tubeless setup use Challenge Smart Tubeless Sealant

The Dune is the Belgian's secret skill-building tire

GRAVEL GRINDER Pro - Handmade Tubeless Tubular inflation/tubeless Please note Challenge Presta ValveMulti Purpose with Bite Gravel Grinder is for cruising at speed and cornering with more confidence in soft and wet conditions. The diamond center tread clears dirt and mud and grips grass and sand while the wide spaced side knobs hook soft ground for traction and help guide the tire through ruts. The mixed tread offers solid rolling resistance with a bit more cornering grip. This handmade PRO version combines a supple, 260TPI Super Polyester casing