Started 2:30. Rode Stumpy w/ 2.3" Compass tires @ 55psi. Hot through the flats to Kings Mt, then shady and tolerable heat. Brought 3L w/ 6 nuun tablets in it (1L=33 oz, nuun recommends 1 tablet per 16oz) in Osprey hydration pack. Drank 1L of water by time reached Woodside. ECdM...fir trail to Manzanita. Reduced psi to 40lb (by feel, then later measured). Manzanita fairly rocky and technical. Had to walk up one short section. May be too technical for me to enjoy thoroughly at this point. Manzanita to Timberview. Timberview was fantastic. Stopped to see Old Growth Redwood which was cool. Onto Giant Salamander which was also fantastic. Singletrack up down and swooping through moderate sized redwoods. Up Star Hill, down Tunitas to Borden Hatch Mill Trail..THE BEST DOWNHILL SEQUENCE IN THE BAY!!!! Astoundingly flowy and fast!!! Climb up Purisima Creek was nice. Very helpful to have the small ring triple all day. Cramped throughout the day, but kept it under control and finished strong. Back to BART at 8:45p. The entire ride was enjoyable and the tires made the ride extremely enjoyable throughout!! Drank almost entire 3L...