I have the HubCapMike's disks ... pop-on ones (16").
The have an interior cut out in the friction ring for the valve stem. Works well enough and if I have to re-air them, I just pry them off. It's been about 5 weeks ... so probably a good time to check my tires.
They loosen up a bit but none have gotten so loose that they have fallen off ... or threaten to. They are a bit noisy ... but supposedly some caulk will fix that. I have chosen to live with it. They will only be on another 6-7 weeks before I break out my studded snows and plastic wheel covers for the winter.
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--- Bror Jace
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