Untitled-3_skid Published October 24, 2011 at 590 × 449 in Caltrain+BART+Bike = Mt Diablo, 80 miles, 6400ft of climbing= great ride, but oh my has the Dumbarton bike path deteriorated! On the Mt Diablo descent (South Gate) a car suddenly slows down, causing the rider in front of us to skid sideways. On the Mt Diablo descent (South Gate) a car suddenly slows down, causing the rider in front of us to skid sideways.