For years I rode with out a mirror, thought it was silly looking(think chrome Pee Wee Herman types that go with plastic handle bar tinsle/streamers), but todays mirrors are so much better looking. I have an bar end type, which I cannot live without, classic example, I took my MTB(no mirror) for a trail ride, and the trail head is a few blocks from my house, I heard a car approaching from behind and I was forced to look back after instintively looking for a mirror that wasn't there. I'm now planning to get the same folding type for my MTB as I have on my other bikes, out when on the road, and folded in when on the trail.