Dyna Beads
I've used the beads in quite a few bikes and they work very well. Never could get the damn things to go through the valve stem though, so I would just add them as I was mounting the tires.
They are not recommended for track use, as the tires will get hot enough that the beads will tend to stick to the inside rather than being free to roll around inside. I still use them on my street bike though.
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