With gravel and adventure riding growing at the fastest rate in all of cycling, tire tread and volume options have proliferated. Challenge tires have remained a premium option for those who seek a great cyclocross or gravel option. Challenge had borrowed the tread pattern for the Gravel Grinder from it's Chicane cyclocross tire and offered it in larger volumes. Now, with Challenge offering this supple 260 tpi handmade casing tubeless ready tire (TLR), the Gravel Grinder Pro Series has reasserted itself as a fast rolling tire that can now take full advantage of it's shoulder knobs for greater traction in rougher terrain redefining the balance that the tire already owned in the gravel world. By applying the lower pressure concept afforded by tubeless ready (TLR) tires, this incredibly supple version is ideal for real race environments.

As mentioned, the Gravel Grinder Pro Series TLR Tire is built around a 260 tpi which is ideal in a racing grade option for the full size range from 33mm-40mm. A specially shaped and reasonably flexible tubeless rubber bead it built with an aramid core, so it has some pliability for reasonable installation yet doesn't really stretch. Challenge has been consistent in their adherence to rim/tire interface standards. These tires can be run tubeless or tubed on appropriately ETRTO sized rims based on tire size. These details matter so you can ensure your rim and tire needs match properly for safety. Challenge is fairly conservative in their specifications, but they have tested to make sure you are safe and you won't damage your equipment, so we recommend you follow them.

The story of the Gravel Grinder design has always been told by it's tread pattern. The pointed diamond knob file tread center delivers excellent speed, especially with a little wear, but provides stability, straight line traction excellent power transfer in packed material and small loose material over hardpack. The distinctive edge knobs are directional for speed and hold while cornering on pavement or hardpack, but also aggressive enough to hook up in soft material. Now, with lower pressures allowed by tubeless use, these knobs will be more active for grip and traction, even in mud, making the Gravel Grinder Pro Series even more effective and versatile on long distance rides or events where conditions can be variable.

The tubeless bead sets up well on rims with short depth bead seats (such as those championed by Stan's NoTubes) and ammonia-free sealants. The PPS2 protection belt helps to prevent punctures, matching the supple nature of the casing.