| Customer Reviews: Average Rating:  Rating : - Unsafe at any speed! After riding my bike with this lock for a few more days, I would lower the number of stars to two or one if Amazon let you change the numbe of stars. I thought I might get used to how heavy the chain and lock are, and how unstable it makes the bike when you are transporting it, but there is just no escaping the fact that this lock and chain set are UNSAFE TO TRANSPORT/CARRY on a bike, period, and it's only a matter of time before someone gets injured or killed as a result of how unstable this set makes a bicycle. I bought this lock and chain set to protect my expensive mountain bike when I use it for commuting or running errands in town. However, it severely disrupts the center of gravity of the rider on the bike, whether the lock and chain set is worn on the rider, wrapped around the seatpost or cross bar, attached to a rack, or carried in a sack on the rider's back or attached to the bike, making the rider and bike much less stable. It might be great for leaving attached to a rack or anchoring point where one habitually parks the bike, or for immobilizing the bicycle at a bike park while one relaxes or watches one's buddies, and it might be okay for a (heavy) motorcycle, (or, god forbid, jet ski or snow mobile), but I would rather risk the bicycle than the joy of riding or a serious crash. I am looking for a less heavy but still at least somewhat secure means of protecting my bicycle that can be carried while riding the bike without seriously detracting from the bicycling experience itself. I really like the light on the key, though. Another thing: I wouldn't let the so-called Kryptonite "guarantee" or "theft insurance" persuade you. There are so many conditions on this "insurance" that it is almost meaningless. You have to "request" the insurance within 15 days of purchasing the lock, and enclose a bill of sale for the bike (how many people have that around?) as well as a recent "appraisal" of the bike by a bike shop, with the request (within the 15 day limit, mind you). I also somehow doubt that kryptonite would pay replacement cost for a bike stolen with this chain on it. My guess is, from the information they require with a request for this "insurance," is that, at most, they would pay some kind of depreciated amount, taking into account the age of the bike, regardless of how much you have put into maintenance or upgrades. This "insurance" is a gimmick, so I would ignore that. Of course, as other reviewers have pointed out, most thieves would probably not succeed in getting away with a bike secured by this lock and chain set without destroying the bike or the anchoring point. It is a monster, but not one you want on a bicycle in motion. + See Full Customer Review |  |