Approximately 45 mph, the selfy stick with my phone on it was getting unwieldy at that speed. I honestly am not in love with my attachment method and I may do a redesign while still using the discs. My initial plan was to drill small holes in the center of the lug nuts and have them tapped for machine head screws which would be counter sunk into the disc. I think I may revisit that. Without going through the outside of the disc options for a rock solid attachment are pretty limited. If I was going to do it again I think I would have a continuous wire ring laminated into the disc, with some type of attachment method protruding out of the back of the disc.
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