<p>It can certainly be done and serious road bikers do it all the time around L.A., but you’re talking about endurance biking not for casual riders. To the ocean from Claremont would take a pretty fit rider about 3-4 hours one way and requires breaks/fueling and a great bike. And spandex. And a spare tire kit. And then you are pertty much toast for riding back. Unless you’ve been riding 100 miles/week for a while, it’s not a good idea. As others have mentioned, riding a bike to metrorail and taking the train to where you want to go is a great idea. But do watch out for traffic.</p>