Sorry I had to step away.
I know what you mean about the yellowing. I may be lucky I haven't experienced it on our BFG's but I bought them going on 2 years ago now.
I restore a lot of baby birds and have experienced that issue with the white walls. All the complaints came from repo tires from Coker. They would just yellow up and seemed no amount of scrubbing got rid of it. I feel the rubber oils underneath were bleeding through.
Anyway, couple years ago switched to Diamondback repo tires and haven't had the issue since.
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