Credit for the descriptions of these rides and the accompanying photographs go to Bill Oetinger. There is probably no one who knows the back roads of Sonoma County better than Bill and there is certainly no one who can describe them more lyrically. So give a thought to Bill if you find yourself reaching for the brake levers as you read about the hairball descent of Trinity or if you smile as you visualize those ill fitting toupées on the hill tops west of Petaluma.