DSCF0902_kevins_tire Published October 24, 2011 at 800 × 570 in Caltrain+BART+Bike = Mt Diablo, 80 miles, 6400ft of climbing= great ride, but oh my has the Dumbarton bike path deteriorated! Kevin’s tire was living on borrowed time; we discovered this on the climb. Thankfully it held out. Kevin’s tire was living on borrowed time; we discovered this on the climb. Thankfully it held out.