Biking 1:13:25 [2] 24.69 km (20.2 kph) +313m
It had not escaped my attention that San Bruno Mountain is quite close to my office, so at the end of the day, I set out to ride up it. The route is quite pleasant, though negotiating the traffic lights in South San Francisco at the start of the loop is a bit tedious.
Oddly, the hardest climb was around km 4, on Sister Cities Blvd - a 500m section at 8.6% according to Strava. The climb of substance was 3.3 km with 170m of climb. Radio Rd promises an additional 150m of climb, but I didn't think I had enough time given my constraints.
The descent was glorious and relatively free from cars. I took it a bit cautiously because it was unfamiliar. My speed peaked around 70 kph on my head unit, and I heard an alarming rattling sound coming from my bike. I quickly deduced that my Contigo tumbler, which I was using for water, was rattling in my bottle cage. This looks to be an excellent and convenient ~90 minute, 30 km, 360m ride.