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If the tire has been repaired properly, there shouldn't be a problem. No where did he say it was plugged, people do patch tires also.
He said he had it "fixed". I assumed a plug. Sure a fix is possible and sure many people do it. My feeling is not to risk a fix on a motorcycle tire just to save a few bucks. A bad fix and life could be over. Not worth it.
 

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My understanding is that regardless of the tire manufacturer (as long as the load and speed index are equal or greater) tire pressure should be adjusted based on vehicle's/bike's manual.
the max pressure @max load on the tire sidewall is a safety note.
based on my records, the tire pressure goes up about 1PSI for every 10F increase in temp.

I contacted Avon in regard to OP's question. I will post their response.
Best practice is to contact the tire manufacturer with questions, so Shinko should also be contacted...
Let's get to the bottom of this once and for all and make a sticky... this question comes up yearly :}.

be safe everyone, protect the vulnerable, god bless
 

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The max pressure on the sidewall is the max COLD pressure that should be used at maximum load. That is the pressure when the tire is at ambient temperature. Once you start driving, the tire will warm up and the pressure will rise. If you start out with the max cold pressure and with the max load on the tire, the tire will get warmer and the pressure will rise above the cold temp pressure, but that's OK and as it should be. All of this is only about max load, though. Two large people riding two up on a big bike, may exceed the bike's max load, but it is unlikely that they would exceed the rear tire's max load, if you are using a properly rated tire.

Most of the time, you should follow the bike mfg's recommendations for a tire of equal speed and load index, but sometimes, the mfg gets it WRONG. Again, I'll point out the issue with Ford Escorts and Firestone tires. Following Fords recommendations resulted in unnecessary deaths and injuries. Many riders, me included, have had serious issues or excessive wear running the Kawi recommended front tires at the Kawi recommended pressure. If the tire is not the tire recommended by the bike mfg, all bets are off and the tire mfgs are no help, in my experience. At one time, Metzler did offer recommendations for tire pressures for specific bikes, but no more. They cover their butts now saying that you should use the bike mfgs recommendations, and only run tires of the size and ratings recommended by the bike mfg. Every other tire mfg that I have contacted told me the same thing.

The tire manufacturer is likely to recommend using a tire made for a tube rather than suggesting a pressure. Adding a tube to a tubeless tire changes the ability of the tire to flex properly, and to shed heat properly. Best advice that I can find is that if you add a tube to a tubeless tire, you should consider the max load for that tire to be 1 level lower than it is actually rated for because of the extra heat the tire will retain due to the tube. I can't find anything about how to adjust pressure, though.
 
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