Disc lock on when bike left for any length of time, if left overnight outside anywhere then the hefty chain comes out to play. And as my bike spends a lot of time parked up outside work and visible to many passersby I don't keep it looking pristine, no point drawing attention to it (although it being bright yellow doesn't contribute well to this). I've seen people comment on it's appearance but if it means they wouldn't be seen dead riding it then chances are they won't much want to nick it either
