September 28 • Quincy

In 2015 the Grinduro event concept was brought to life in a joint venture between Giro Sport Design and Sierra Buttes Trail Stewardship (SBTS).

Grinduro! California is one of four Grinduro events this year. The Scotland Grinduro took place on July 13, while upcoming events in Canada and Japan will take place August 17 and October 12 respectively.

The unique format of Grinduro combines the best elements of a mountain bike enduro with a gravel grinder-style road race. Festivities include two days of excellent food, a handmade bike show, an art exhibit, live music and camping.

Although race entries for the uber-popular Grinduro! California are sold out, the festival is open to the public. Come cheer on the racers and soak up the Grinduro! vibe in the beautiful northwestern Sierra mountains.

Grinduro is supported by Giro Sport Design, Rapha, Maxxis, Fabric, and Cannondale.

Learn more at