I agree with Tim. I have had a wink in the car and small (slightly) convex bike mirrors on each side for many years. I even got some grief about the side mirrors when I started using them, but they're great for seeing close beside the car. You just can't see any distance behind you with a convex mirror. I tried one for a race last year and immediately went back to the Wink. If you're in a mixed group with big differences in lap times, the sooner you can see who's coming up to lap you, the better. Passing flags are obviously very helpful but are usually displayed at a corner and that can be too late when you're in a battle. Trust me, I know. When I know who's coming up behind me I can usually effect where I get passed without screwing up my lap time too much or interfering with my race. And sometimes that passing car can be a big advantage for getting by that guy you've been chasing down. That's my theory and I'm sticking with it!
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