if you like visuals ...

go to http://www.actc.org/profiles/index.php and locate "Mt. Diablo North" and "Mt. Diablo South" in the drop-down menus. You can view the profiles and compare the two.



While the scale is different for the 2 climbs, and they are offset, it gives you an idea of the relative grades. Bear in mind past about the halfway point the North and South routes converge (at Summit Dr.)