I went and got a short loop in this morning, including El Toyonal/Lomas Cantadas, first time with a Garmin and my new 34x26 low gear. That always spanks me - think I'll get my 27 out for the ride though. Here's my Garmin profile for the climbs that I've done from the list:
Marin (note, I had to take two detours at the top to finish this, along with an unplanned tack near the top - the gradient dips to 20%, I definitely wouldn't advise trying that again)
South Park (OK, this was a descent, but you get the idea, possibly slightly underestimating the steepness of the top section)
Centennial (this was tough, that section past the half way mark of 15ish% does make you crawl)
El Toyonal/Lomas Cantadas (Lomas starts just after the dip, just before mile 5 on the plot is a beast)
Claremont (probably the easiest of the bunch, but it gets to you by the time it gets steep. The Garmin data is probably a little whacked here as there's more tree cover to contend with)
