jack the wheel up. pull valve stem with it at top.. see if it's sealed tot he rim or loose..
soundguy
Doesn't that depend on the tire/tube/valve size and type ?
I think once you get to .... ( over some size or load rating ) they're secured through the rim with a nut.
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GENERALLY jack up the wheel, put the valve at 12 o'clock, remove the valve stem.
If liquid comes out they are FULL, like WAY FULL !
Rotate the wheel SLOWLY and note at what point liquid comes out, there was a table or formula somewhere that showed how to convert clock positions to percentage full.
Get a tiny bit of it on your finger and touch it to the end of your tongue, you will KNOW if it is CaCl - don't lick or swallow, just spit a few times (-:
I haven't done this with RimGuard, but if it is in fact beet juice residue I would expect it to be sweet tasting... ?