i've had a total of 4 bikes stolen, one of which was recovered (i knew the a$$hole who stole it). of these four bikes, none were secured in any fashion. also, none of these bikes cost very much. i live in a college town of about 25,000 ppl, and bike theft is surprisingly rare. i currently secure my bike with a four dollar, 3-digit combination lock/chain, which, incidentally, is worth about as much as my bike. ii recently bought a gigantic trimax chain; why i did, i dont really know. i think i will put it on ebay.