The Merciless Metric Century is a fun and challenging 64-mile ride with 5,500′ of elevation gain that takes you down the spectacular San Mateo County coastline, up winding mountain trails, past ancient redwoods and back through pristine watershed areas. This route is recommended for seasoned riders or teams who seek new challenges and a hard-earned sense of accomplishment.

Riders under 18 must be accompanied by a parent or guardian.

Video from the 2018 Devil’s Slide Century courtesy of the ChiDonChea Channel on YouTube

There are three aid stations along the course (see map below). Check our Fast Facts page for starting times and additional details. You can also follow us on Twitter, Facebook and Instagram to get the latest updates.

If you have questions about the course, please email us at


  • Routes are subject to change based on CalTrans and local government requirements and/or weather conditions.