Weather is great. Mild winds, somewhat turbulent. Mostly from the North West. Temperature in the 50's. I wore arms, knees, and a base layer. The legs felt pretty good from the start. I was sufficiently warmed up by the time I reached the end of OTR. The wind was a bit unusual, it wasn't constant. I made my way up Banducci. There was a bit more traffic than normal. When I reached the summit, I took a few moments rest. Checked the GoPro camera battery. It was at around 63%. I made my way down the mountain after letting traffic by. Practicing my tuck, reaching over 40MPH. The trek to SS was mostly into a modest headwind. I was averaging 15MPH most of the way out. I made my way around the backend and through the tunnel in under 1 hour. I was calculating how much time I'd loose, till Boss Hogs. After going through SS, I headed back on Banducci. The bike path is great. No worries about traffic. I had a cross wind going through CV, heading north. Not too detracting. I made it to Boss Hogs in about 1:21-ish hours. When I got to the last climb, I pulled over to check the GoPro battery. The camera was off, so it must have quit within a minute or to, prior to stopping. I swapped out batteries and got back on the road. I tried to keep a good tempo and kept my momentum going over the top. No red-line pushes. The false flat was recovery. Route 202 was mostly traffic mitigation. I had a headwind at this point. OTR was mostly fun and games. I made my way up Mariposa and back home. Concentration was good. I had a few things to think about. Balance and form was good. Ailments, some slight left knee soreness on the last half of the ride, that didn't linger. Gear worked great. When I swapped out batteries on the GoPro, I turned it on and started the recording. About 30 seconds later it powered down with an "SD Card" error message. I rebooted the camera and started recording. From that point on, it worked flawless. Other notes, I saw one cyclist in SS. He was on a Niner mountain bike.