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I put a couple of those small, round stick-on convex mirrors on my SG's flat mirrors. Although I've eliminated blind spots, I still turn my head every time I change lanes.
I have Russ Wernimont Design (RWD) bar mounted mirrors on my 15 RGS. They look flat, but they are convex without the fish eyes on the HD Split Vision. At the tapered end they curve outward just slightly (not even noticeable unless you're looking for it) to capture my blindspot. They're in J&P Cycles or Drag Specialties. About $50 each, a $100 for the set. Offered in black or chrome with different design patterns. Best set of bar mounted convex mirrors out there, IMO.
I have flat mirrors but I purchased them because of what they say on them, not because of their configuration. I prefer flat mirrors to convex anyway as there's less distortion and you get a truer image of what's behind you. I find the distortion of a convex mirror gets even harder to read when there's added vibration and buffeting at highway speeds.
Personally, I think no mirrors should be allowed until a rider has been on the road for an entire season. That way they will learn to TURN THEIR HEAD AND LOOK instead of relying on a mirror. Some people that transition from a car to a bike never really learn to do that and don't realize the importance of it until it might be too late.
I prefer flat. I can see just fine with them on both bikes that I have. I can't stand the distortion with the convex mirrors especially in the dark on the highway with traffic merging and changing lanes all around you. I also am in the camp of turn your head and look before a major move. I also use hand signals to change lanes or make a turn. The cagers may not know what I mean but it may draw their attention as far them going "what's that guys doing" and get them to see my directional.
Modern mirrors with a slight convex are my choice. I had to replace a damaged one some years ago and ended up with one of each for several years. The flat one was OK, but I preferred the slightly convex, which gave a wider rearwards view. With mirrors seeming to get smaller these days and my eyes getting older, we need all the help we can get!
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