What is tuff?

Tuff (tŭf) is a general term for all consolidated pyroclastic, volcanic rocks.

The name, Mammoth TUFF, is a nod to the Long Valley Caldera and the volcanic stone that defines ‘gravel’ in the area. The caldera was formed about 760,000 years ago in a volcanic eruption from which the magma still underlies it, heating underground water and fueling hot springs the event will ride by. The short course is around 45 miles with 2,000 feet of climbing and will circle the famous caldera. The long course is around 100 miles with 8,000 feet of elevation gain and travels through the Volcanic Tableland formed by the Long Valley Caldera. Prepare to be transported back in time on routes used by miners and even further back.

This land is our land...

Our great country has taken liberty to protect the public lands throughout the Eastern Sierra and preserve the vast playground for future generations of explorers, naturalists, and visitors. Because of this, 10% of the entry fee will go directly back to the land. As riders wind through wide open roads on seemingly forgotten land, they will take pride in knowing they are giving back to the U.S. Forest Service and Bureau of Land Management. “This land is our land,” after all.

This land is your land...

United States Department of Agriculture
INYO National Forest

Mammoth Lakes Ranger District is located in the northern half of Inyo National Forest, and is centered around the town of Mammoth Lakes, CA.

U.S. Department of the Interior
Bureau of land management

The Bishop Field Office cares for a unique vestige of wild California, emphasizing conservation, education and partnerships. Our mission is to sustain the health, diversity and productivity of the 750,000 acres of your BLM public lands we are entrusted to manage.

Who are the TUFF?

David Sheek  &  Amanda Nauman

David Sheek created this event with his partner, Amanda Nauman, to share the adventures they have cherished around Mammoth Lakes and as a thank you to the town that has given them countless memories. With more than six years racing at gravel events across the country, during the pivotal rise of the discipline, and years of training and exploring the Eastern Sierra playground, Sheek and Nauman have built a TUFF adventure for all to experience. “These are the roads I’ve trained on to prepare for some of my biggest goals and I want to share the magic and see who’s “tuff” enough to join me,” said Nauman.

So, in 2019 David Sheek founded Sheek Group to build the TUFF. After a few years of talking about and planning for an event in this area and the desire to continue to develop product in the outdoor/bike industry, we are happy to share a lot of TUFF in the future. We are happy you have an interest in Mammoth TUFF® and look forward to you joining us in Mammoth Lakes, California.