Climb from the Thurman Flats Picnic Area to (or toward) Onyx Summit (elevation 8,443')!  
Three routes to choose from:
Challenge I: Make it to Angelus Oaks - 17 miles, 2,300'  Map/Profile 
Challenge II: get to Greyback Amphitheater - 35 miles, 3,800'  Map/Profile 
Challenge III: To Onyx Summit - 55 miles, 6,400'  Map/Profile 

ROUTE SLIP HERE

YOU MUST REGISTER FOR THIS EVENT BY JUNE 7th -
VOLUNTEERS AND RIDERS PLEASE REGISTER!

Registered Rider List

Picnic lunch after the ride.  SAG Volunteers needed - email ridecoord@bikeirvine.org.