I had ridden many times on Mt. Diablo with Grant Petersen of Rivendell Bicycles in nearby Walnut Creek .
This was my first time to ascend the mountain from the south side , which is where Danville is located .
I had ridden many times on Mt. Diablo with Grant Petersen of Rivendell Bicycles in nearby Walnut Creek , but this was my first time to ascend the mountain from the south side , which is where Danville is located .