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1. Put a grease cap on your hub, or the bearings may be starved of lubrication. While you're at it, prolly a good idea to re-lube the bearings, which may already be dry-ish.
2. Consider shorter valve stems, so you don't need to drill a hole in each pizza pan. Motorcycle valve stems? (At least, the ones on my bikes are shorter than those on my cars, but unsure if the hole in the wheel is the same.)
3. I would not drill into the steel wheel for fear of causing a weak spot, corrosion pathway, or imbalance. Rather, how about researching use of the balancing weight clips as mounting points. 3 holes, screws flush mounted by countersinking the holes in the pizza pans, or making dimples. Stainless steel screws. That said, you may have corrosion due to electrolysis between different types of metal with alu pans and ss screws. Anybody here know about this?
4. Velcro? If the pans fit snugly just over or inside the lip of the steel wheel, maybe adhesive-backed Velcro all around the rim would work. No rattles!
5. With pizza pans mounted, can the wheels still be balanced on a high speed machine? If so, you're balancing the whole package, much better than just the wheel/tire without the pan. Stick-on weights on inner surface of wheel should work.
6. What size wheels are those? Exactly how wide are the pizza pans? Fit just inside of just over the wheel rim lip?
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