When I was working up north we used to put them in all tyres bar the drive tyres of trucks. Including the medium/light trucks and the farm utes.
Initially they were trialled on the truck trailer tyres as during the hotter months you would not get more than a Katherine to Adelaide and return run out of them. After using the beads, tyres would easily push out to 80-100k on the black top.
They are also reusable, which we would do for trailer tyres.
I think the theory is that they will fill the low or off balance spots in the tyre when it is rotating at enough speed. What we did find though was with the vehicles that weren't always at a high speed, say the farm utes, where most of the tyre wear was caused by the conditions they were operating in, the inside of the tyre would show wear from the beads rolling around. I think the worst one was completely bold inside, ie; none of those ribs were visible.
I believe they would be a good alternative to weight balancing, but I am also a bit afraid to try them on my own car. Maybe Il get the gumption to give it a go with the RRC ute..
'15 Discovery 4 HSE- The family bus and the kids like it!
'89 RRC- My favorite of the bunch!
Ex '03 Commodore 'S' ute- 450hp of uncracked 5.7lt and 6 speed manual uteness - Still crying that its gone
Ex '06 GLXR Triton- *Gone and forgotten*
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