Thieves will kick the bars and break the fork lock or a couple big guys will pick it up and run into the back of a van with it.Takes about 3 to 5 seconds.A large bolt cutter will take care of chains or cables if the bike is anchored to something.It only adds 3 to 5 seconds to the theft time.An alarm can be disabled fairly quickly by cutting either battery cable.This adds another 3 to 5 seconds to the theft time.Using all these deterrents,it still only takes 15 to 20 seconds to steal a light weight bike.our local PD had a couple convicted bike thieves demonstrate their techniques.The bigger bikes take a little longer but the same techniques apply.