I had a fzr1000 yamaha that had two hole mounted aero shaped mirrors.
For round hole mount mirrors, I would go with at least a 10mm stalk They use a standard 10mm thread except some Yamaha round mount mirrors have a left hand thread on one side. You could cut the stalk off to a couple inches and weld on a plate to mount it.
I am thinking of putting tubulators in front of the mirrors on the front fender on my Econoline.
I wonder if 20% of the vehicles aero drag is coming from the mirrors? Seems high.
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