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Hey Ironmedic, you said they expand? so how come the other people run at 40? wont they expand to like 44? I dont know :( my pirellis might explode :( I hope they dont
 

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retail tire companys recommend as a rule thumb it should be -10psi the max lpsi load/ Air in tire will expand and contract with tempeture, NITROGEN doesn't expand/contract nearly as bad as just air. I have 20" and run them at 40 psi with NITROGEN..

:)
 

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I run mine at 40psi...
 

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40 psi........
 
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