DSCF0915_fix_tire Published October 24, 2011 at 800 × 517 in Caltrain+BART+Bike = Mt Diablo, 80 miles, 6400ft of climbing= great ride, but oh my has the Dumbarton bike path deteriorated! Repairing a tire shredded by the shrapnel on the Dumbarton Bridge. Repairing a tire shredded by the shrapnel on the Dumbarton Bridge. Bridge toll for cars? $5. For bikes? Could be $20-60, maybe even more, depending how badly you damage your tires.