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HI,
I don't think they're worth it at all. I doubt they really prevent flat-spotting. If storing your car, inflate the tires to 59PSI for the duration.
A note about flat-spotting, this used to be a much more serious and prevelant issue back when tires were steel-belted.
The belts in today's tires are primarily Kevlar and Kevlar-like materials which don't have a permanent memory. Once these more modern tires come up to temperature/pressure, any flat-spotting is largely dissipated.
If your car is going weekend-to-weekend without being driven, I doubt you'll experience any serious permanent flat-spotting. You can always super-inflate them and readjust tire pressures the next time you take it out. That will be more effective than any rubber pads...
Happy Motoring!... Jim'99
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