DSCF0914_bad_pavement Published October 24, 2011 at 800 × 613 in Caltrain+BART+Bike = Mt Diablo, 80 miles, 6400ft of climbing= great ride, but oh my has the Dumbarton bike path deteriorated! The “road” of grainy, choppy pavement leading up to the Dumbarton Bridge. Not enjoyable on a skinny-tire bike. The “road” of grainy, choppy pavement leading up to the Dumbarton Bridge. Not enjoyable on a skinny-tire bike.