In my application, I had to cut two of the center holes larger to clear the disc brake mounting flanges. As you indicated, the two that fit snugly didn't have as much of a tendency to shift after jumping off curbs, etc., but once the one on the other side of the wheel shifted, the tension on the T-bolts became uneven, and the whole mess started to get wobbly.Measure carefully when installing the fasteners and center hole, then the covers won't be able to shift. I would reject direct attachment. Just wedge them, using the standoffs I indicated, at several points around the wheel's perimeter. Three is probably enough--five would be better.
These pans are 18-gauge and pretty beefy. If that's a concern, one could always go with other 14-gauge versions. However, that means extra money and extra weight.
https://www.webstaurantstore.com/am...ight-aluminum-coupe-pizza-pan/124HACTP22.html
Obviously, purpose-built Moon discs are the perfect solution...if you don't mind spending $90 apiece.
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