Videre non videri
Join Date: Sep 2004
Location: Gothenburg, Sweden
Posts: 3,208
Bikes: 1 road bike (simple, light), 1 TT bike (could be more aero, could be lighter), 1 all-weather commuter and winter bike, 1 Monark 828E ergometer indoor bike
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Maybe if you ride in heavy city traffic, but I prefer to use my ears.
I can hear all cars and motorcycles long before I can see them where I ride, so they can't really sneak up on me.
When I hear them around a hundred metres (4-5 secs) behind me, I turn my head to check what kinds and how many there are, then look forward again and just wait for them to pass. While they are passing me, I shift some focus to my peripheral vision, and keep track of them that way.
I have no need for a mirror.