It has something to do with breakdown of the rubber. If you take a tire that has been on concrete for a while there is the black stain. it pulls something out of the tire. I don't know exactly what it is. It's like leaving batteries on concrete with the draining issue.
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2011 Ram Laramie
2010 Rockwood 8319ss
2010 Polaris sportman 300(wife's)
2005 Polaris sportman 500HO (mine)
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