I never let my bike out of sight unless it is attached to something with a a respectable lock... Luckily where I live, crime is not bad and bike thefts are uncommon. If I lived in a high crime area, don't know if I could let my bike out of sight.. / Here at Bike forums, I remember some cyclists posted he/she went to take a stroll down the hillside at Big Sur, Calif. to have a closer look at the scenery.. As he/she ascended the hill, he was able to see someone put his bike into their pick up and tear off. Assure, you , you'll never catch up with your thieves while running after them in bike shoes..