<https://www.fjrowners.com/threads/tires-again.143885/>
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"I know tire threads here are very well liked, so I thought I'd start another one.  Plus I had something interesting happen. 28,500 miles on my 14ES and I need to change the tires again.  Stock tires changed at 9,500, Pirelli Angel GT's were next and were off @ 19,000.  Put The Shinko 009's on and they are now coming off.  And not because they have no tread left.  I think they might last another 3,000 or so.  I have pressure indicators on the valve stems, they go green, yellow, red as the pressure goes down.  About two weeks ago I noticed the rear one going yellow so I put air in and looked for a leak.  Didn't find anything obvious so I kept riding to see what would happen.  About every three days I had to add air.  After 2 weeks of this, I brought some Snoop Leak Detector home from work and basically just sprayed it on the tire.  What I found was a couple of very small leaks right through the rubber of the tire.  No obvious cuts, holes or cracks, but there is no doubt air is coming through the tire  (maybe pinholes, I did not get out a magnifying glass). My theory is (the tires are cheap, $160 for the set) that they are drying out, getting thin from usage, and no longer holding air.  Since they are low cost I'm thinking they got less antioxidant and uv protection added to them than you will find with more expensive tires (they do exposed to the elements sitting out all day at work).  With that said, I was very happy with the tires in relation to the cost.  They handled well and lasted for 9,000 miles.  Dunlop Road Smart 3's are going on and we'll see how they do."
<https://www.fjrowners.com/threads/tires-again.143885/#post-1175106>