We've been using them for a few years, on the larger mud terrain tires, and on dually wheel applications, where the wheel doesn't fit our spin balancer. They seem to work good, with no comebacks.
The things you have to make sure of:
1. No moisture in the tire. It needs to be clean and dry inside for the beads to freely roll and not clump together. Need a good air supply with a water filter/separator to keep moisture out of the tire, when inflating. Never use fix-a-flat products. If you do, then you have to dismount the tire, remove everything and start completely over after it dries out. Some stuff will always leave a sticky residue and will prohibit the beads from rolling correctly.
2. If you ever have the tire patched (don't use plugs), you will need to make sure there is no residual glue left inside the tire where it was ground down to install the patch. Applying baby powder will take care of this.
You also have to determine if you want to install a new bag of beads at this step as they have to be removed from the tire prior to fixing it. We have been able take a cup and scoop out the beads prior to repairing the tire, then pouring them back in the tire with pretty good luck.
3. If you use the filtered valve cores that come with most packs, then that should take care of any beads coming out when airing down. Just press the valve core down to release the air (don't remove it). The filtered valve core also keeps the small beads from becoming trapped in it, and the valve core not sealing back.
4. Yes, the beads do become smaller as they constantly roll and rub on each other. That's where the different manufacturers hawk their products as being better than the competition. We have seen a pretty good difference in the sizes when replacing tires later on down the road which we installed the product in. It was still working though.
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2011 Flagstaff 831 RLBSS
A 72 hour hold in a psych unit is beginning to intrigue me as a potential vacation opportunity.
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