Whoa boy; cables are easier to cut then chains especially those heavy chains from Krypto. The problem here is that if you’re already locking the bike with a U-Bolt do you really need to be lugging around a heavy chain as well? Not necessarily, a thick cable would also work because it requires a second tool to cut the cable that most thieves are not going to bother carrying, but you need a lock that would hinder cutting the shackle like the Discus.