Bike Momma. The picture you see is part of the Mt Tam DOUBLE century. There is a century in that area- the Marin century which occurs on the same day. However, the route for that ride goes north of Tam. The Double century people do the Mt Tam route and then do the Marin century route. Takes them about 12-16hours as it has a lot of climbing. I did the Marin century this past year- 5500 ft (if I remember correctly) elevation gain- some at the beginning, some in the middle and end. I will do that century again.

Also check out the Mt Tam Double or the Marin century for ride reports.