The river trails take you through some very scenic parts of the metropolis but maybe you have seen all that and are looking for something new. Riding to Azusa on one one path and back on another is neat and very dramatic approaching the mountains. The Pacific Coast Coast Randonneurs have some routes. I did one with them called 5 rivers or some such.
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I don't do: disks, tubeless, e-shifting, or bead head nymphs.