Thanks bjt. That was my guess since your arms are still in the same relative position with respect to the mirrors. Riding bikes for 35-40 years, I like to know what's happening behind me, but statistics show that 77% of crashes occur from the front, 16% from the sides and only 7% from the rear. With the round spot mirrors in the corner, rear view is better and for now I can live (I hope) without the mirror extensions.