• Pro Men
  • Pro Women
  • Expert Junior Men 13 – 18
  • Expert Men 30 & Under
  • Expert Men 31 – 40
  • Expert Men 41 – 50
  • Expert Men 51 – 60
  • Master Men 61+
  • Junior Women 13 – 18
  • Expert Women 30 & Under
  • Expert Women 31 +
  • Singlespeed Open Ages

*Eligible for Triple-Crown points

For riders seeking the ultimate challenge of both fitness and bike handling skills, the Sierra Buttes Trail Stewardship introduces a new three-event series for 2017 called the Lost Sierra Triple Crown.

  • Tandem:  If you are riding a Tandem, then the following will apply:
  1. Both riders register separately within one of the categories provided
  2. You MUST check-in together and notify us that you are on a tandem
  3. You will get 1 bib number
  4. You will get a time
  5. You will not be eligible for winning your category
  6. You will not be eligible for triple-crown points


The Grinduro course features a blend of pavement, dirt road, gravel road and singletrack.

  • Riders must obey all applicable traffic laws during the event and are encouraged to use common sense, keep their head up and stay in their lane of travel. At no time will there be a closed road.
  • For the first 3 miles (paved section to County 403 Road) riders in the peloton will have full use of the right lane of travel, but cannot ride left of the yellow line into the oncoming lane at any time during the ride.
  • Once the route changes to dirt road, riders must obey all traffic laws and use common sense, keeping their speed under control.
  • Riders should expect vehicle traffic on all roads, along with ATVs, motorcycles, livestock and wild animals. Stay in your lane and follow the rules of the road.
  • Once a rider is dropped from the main peloton they must ride as far right as possible in single formation. This applies to both the pavement and dirt sections.


Be cool, have fun and enjoy the ride. Those are the rules!

For those of you who need things spelled-out, here you have it…

    1. All riders are required to wear an approved helmet and cannot remove it at any time while riding.
    2. No support or follow vehicles are allowed. Aid stations will be well stocked and able to handle participant’s needs.
    3. Riders must ALWAYS obey traffic laws and strictly obey any law enforcement persons or official ride personnel. In the interest of your own safety, you should always assume the same level of vigilance in riding your bike during the event that you would under normal circumstances.
    4. Headphones/ear buds are NOT permitted during a ride.
    5. Riders must respect the directions of all course marshals at all times. If you’re told to stop by a course marshal, moto official, uniformed officer or otherwise, YOU MUST STOP!
    6. All riders must attend the “riders’ meeting” held at the staging area 15 minutes prior to the event.
    7. The responsibility of keeping on the prescribed course rests with the rider. A rider may not leave the prescribed course unless escorted by public authorities or a ride official.
    8. Shortcutting and/or cutting trail switchbacks or course is not permitted and may result in disqualification. A rider is required to stay on the designated route. It is the rider’s responsibility to know the designated ride route. Lack of tape or barriers will not constitute an excuse for cutting the course.
    9. Laws and ordinances of appropriate jurisdictions shall be observed during participation in the event.
    10. A rider may be disqualified for damaging or destroying public or private property. A rider may be held liable for all cost associated with the damage or destruction.
    11. Grinduro officials reserve the right to make changes to the course, delay start times and/or postpone the event as necessary for safety or security purposes or at the request of permit issuers.


Each category winner will take home a custom Grinduro trophy in addition to premium equipment from sponsors including Giro, Fabric, and SRAM.


THE BEST BIKE: You can ride any type of pedal-driven bicycle (no electric-pedal assist!), although we recommend a cyclocross bike or mountain bike. The ultimate setup is probably a disc brake-equipped cyclocross bike with fast-rolling, tubeless clincher tires. Be prepared with at least two extra tubes, a multi-tool and mini-pump.

A WORD OF WARNING: It’s rough in the Sierra Nevada Mountains. Seriously rough. On our recent course pre-ride we had nine flats in our small group, with one flat on a 4×4 Toyota truck and one on a Mercedes wagon. If you come out on your road bike with inner tubes in your tires, you’re almost guaranteed to end up finishing on foot, if at all.

We’ll be at high elevation in the fall, so bring layers—ideally arm/leg warmers and a jacket—just in case weather rolls in.

There will be feed zones (and an excellent lunch!), but smart riders will bring at least two water bottles and their favorite nutritional supplies.

You can ride this loop in road shoes with road pedals, but we recommend mountain bike pedals and shoes for their versatility.

And don’t take the start line without a helmet on!


Friday October 6th

Gates open at the Plumas-Sierra Fairgrounds

12:00pm – 9:00pm
Sierra Nevada beer tent opens

1:00pm – 9:00pm
Grinduro pop-up shop

3:00pm – 7:00pm
Registration / Check-In

3:00pm – 9:00pm
Food Vendors

Saturday, October 7th

6:00am – 7:30am
Registration & Check-In at the Tulsa Scott Pavilion
Pop-Up Store open at the Tulsa Scott Pavilion
Riders Breakfast

6:00am – 9:00am
Food Vendors open and located in Grinduro Village


Mass Start at the Plumas-Sierra County Fairgrounds
Ride with 4 timed segments, aid stations, snack stops, lunch & good times at The Sierra

12:00pm – 2:00pm

3:00pm – 7pm
Grinduro pop-up shop

3:00pm – 9:00pm
Food Vendors open

3:00pm – 12:30am
Sierra Nevada beer tent

3:00pm – 7:30pm
Finsh Line Studio Portraits

6:00pm – 7:00pm
Music TBA


7:00pm – 8:00pm
Awards (Main Lawn)

8:30pm – 9:30pm
Music TBA

10:30pm – 11:30pm
Music TBA

11:30pm – Late

Sunday, October 8th

7:00am – 10:00am
Pop-Up Store open at the Tulsa Scott Pavilion
Food Vendors open and located on the Main Lawn

Check-Out & Gates Closed


In short, Grinduro is just what the name suggests: Gravel Road Race + Mountain Bike-Style Enduro = one long loop of pavement and dirt, where finishing times aren’t based on overall loop time, but four timed segments (each roughly five-to-ten minutes).
But Grinduro is not just a bike race. It’s a celebration of cycling with as much emphasis on the fun as the ride, with excellent food, an impressive display of art and incredible handmade bikes, live music, camping and a festival atmosphere.

The course is a serious affair (7,500-feet of climbing in 60 miles) but the Grinduro isn’t meant to be a sufferfest. We’ve linked together some of our favorite roads in a quiet corner of California’s Sierra Nevada Mountains. The course features a mix of surfaces (smooth pavement, gravel and hard-packed dirt) with two main climbs, one long valley and two world-class descents. One descent includes a fast and flowy singletrack trail. The other descent trends downhill for 30 miles!

With a Gran Fondo-style mass start from Quincy, you’ll be pedaling out of town and up the first climb alongside your heroes and the pace will be conversational—because overall time doesn’t matter, only the four timed segments. The Grinduro segments (the exact sections will be shared on September 26) are designed to reward the most well rounded of rouleurs.