Here are a couple leaving from the
San Fernando Valley Bicycle Club
http://www.shprung.com/sfvbc/?ride=436
http://www.shprung.com/sfvbc/?ride=461
Different Spokes of Southern California also has a nice route going from Griffith Park (near Silverlake) up La Tuna to Pasadena, but their route slips aren't online.
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It's like riding a bicycle