"Are burning calf muscles something you just can’t get enough of? The Seven Hells of San Francisco are back! The ride will hit some favorite hills from previous years, including Twin Peaks and 21st Street, as well as take on a few new monsters. With breaks and a moderate pace, this 35-mile ride should take around 4 hours. Strong riders only, please. Granny gears highly recommended. We’ll make every reasonable effort to stay together as a group. Rest stops announced on day of the ride."