Rundle’s Revenge is a two-day fun-fest that includes mountain biking and trail running. No, it’s not a duathlon.  Rundle’s Revenge is so much more than that! Where duathlons combine the two events into one day, Rundle’s Revenge gives you a full day for each event.

If you only want to do the mountain biking on Saturday or just the trail running on Sunday, you can! There are shorter courses and longer courses, and for you competitive masochists that both bike and trail run, you can participate both days for maximum pleasure. Bring your A-game to the full donkey and you just might qualify for The Iron Donkey Award. Really…who wouldn’t want to be an Iron Donkey?

Upcoming Races

Jun 27 2021
50 KM
Multiple Loop Course
3 Elevation Rating
Hilly, ~2500-7500 feet in 50 miles
3 Surface Rating
Some rocks, root, and/or ruts


50 KM View course top times

Date Finishers Top Result Top Result (F)
06/28/20 Race Cancelled
06/22/19 34 4:50:41 5:19:16
06/23/18 33 4:45:33 5:19:41
06/25/17 40 4:30:35 4:56:30
06/26/16 22 4:31:08 5:28:03
06/27/15 28 4:28:04 5:22:26
06/24/12 48 4:43:07 5:23:05
06/25/11 27 4:43:10 4:52:46
We try to keep the most accurate information about this race, but changes do happen. Always visit the official race website for the most up to date information. If you see an error, please let us know

Sangre de Cristo Ultras

  • Sep 25, 2021
  • Westcliffe, CO
50 KM 50 Miles 100 KM 100 Miles 200 Miles