Century Banner Century Banner

Rider Responsibility

  • The Grizzly Peak Century is a tour, not a race. Riders must obey the California Vehicle Code, and follow all the rules of the road. Riders may be cited for violations of the Vehicle Code.
  • Riders must wear bicycle helmets at all times when on their bicycles. No helmet — no route sheet, no food, no exceptions.
  • Riders are responsible to ensure that their bicycles are in superb mechanical condition, especially cables, brakes, tires and bar-end plugs. For a pre-century bike check, see our sponsors page.
  • Riders should carry supplies to repair and inflate a flat tire, a water bottle (two, if forecast temps are above 70 degrees), money, and identification.
  • Please be courteous to other road users. Your behavior reflects on our entire bicycling community.

Food Safety

Riders are requested to keep unwashed hands and bike gloves away from the food tables. We ask that you remove your bike gloves and wash/disinfect your hands, or else let the century volunteers serve you. We appreciate your cooperation. Thank you.

Clothing Drop at Island Rest Stop

You can drop excess clothing at the Island rest stop and we'll move it to St Mary's (the finish). Not from other rest stops. You just fill a paper bag, write your name on it, and we'll transfer the bags. We'll do our best, but you use this clothing drop at your own risk.

Don't follow!

The century takes place on popular cycling roads. There will be riders on the course who are not doing the century, or not doing the route you are riding. Don't follow! Do your own navigation.


Ebikes are welcome on all of our road routes. For the gravel routes, only Class 1 ebikes are permitted due to restrictions in East Bay Regional Parks. Class 1 ebikes are those with only pedal-assist (no throttle) and a limit of 20mph for the assist.


Our famous Grizzly Peak Century post-ride meal is hearty, homemade, and hot — gourmet cycling food with plenty of vegetarian and vegan options. The rest stops along the way provide fruit, handcrafted cookies, homemade breads, and more prosaic carbs.

Drinks, etc. We provide a sports drink, water, and some sodas. We do not provide sports gels or bars, nor any other sports drinks other than what may be provided by our sponsors. If you need these, bring your own.

Route maps and cue sheets are provided. The routes are clearly marked on the road. The route marks consist of yellow arrows. Where routes diverge, the arrows are supplemented with yellow chalked directions.

Basic mechanic service is available at some rest stops. Mechanics can make emergency fixes, but don't expect them to replace a derailleur or overhaul your headset.

SAG vehicles patrol the route. They will help you if they can, and they will transport you forward on the course if need be. SAG drivers carry spare cables, tubes, and tires (common sizes only). You'll be asked to pay for any supplies used; carry some cash. Outside of emergencies, the SAG drivers' first duty is to aid riders who are continuing under their own power. Keep this in mind if you accept a ride from them. SAG drivers are not mechanics, nor taxi drivers.

T-shirt art from the 2013 Century
by Stephen Linden