I have a ground anchor, mammoth chain, and a ?200 alarmed granit disclock, all in about ?500 of security as it has to live outside. Before the disclock someone had a go with boltcutters but were interrupted by my wife. What rcmaf says sums it up though, re ride something they don't want. It shouldn't be that that is a factor when choosing a bike but in the real world it it. Also, put a cover on it. Out of sight etc.