70mackMB Posted April 21, 2018 Share Posted April 21, 2018 The question is. How much can the air pressure vary between duel tires and be legal? .....Hippy Quote Link to comment https://www.bigmacktrucks.com/topic/53171-tire-air-pressure/ Share on other sites More sharing options...
Ezrider Posted April 21, 2018 Share Posted April 21, 2018 i don't think there is anything that says that dual tires need to be within so many psi of each other, obviously you would want them to be pretty close but as far as being illegal to my knowledge it would not be until one tire is low enough to be considered low/flat. witch is a certain % of the rated max psi i think somewhere around 65-70 psi on your normal truck tire. Quote Link to comment https://www.bigmacktrucks.com/topic/53171-tire-air-pressure/#findComment-397262 Share on other sites More sharing options...
Popular Post RowdyRebel Posted April 21, 2018 Popular Post Share Posted April 21, 2018 50% of the max inflation listed on the sidewall is considered "flat"...so if you're running 16-ply tires with a 120 psi max, you could have one @ 120 and the other @ 61 and be legal. 120 & 60 and you're in trouble. Best to keep them as close to equal as you can, though, for better wear. 3 Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment https://www.bigmacktrucks.com/topic/53171-tire-air-pressure/#findComment-397263 Share on other sites More sharing options...
Ezrider Posted April 21, 2018 Share Posted April 21, 2018 i couldn't remember what the % was so i guessed higher than i thought it was...lol i would never intentionally run with a low tire. tires are too expensive for that. i carry a glad hand air hose and a tire chuck if i have a low tire i air it up/ and or put in a temporary plug to get to wherever to fix it. Quote Link to comment https://www.bigmacktrucks.com/topic/53171-tire-air-pressure/#findComment-397264 Share on other sites More sharing options...
RowdyRebel Posted April 21, 2018 Share Posted April 21, 2018 I put a quick-connect on my air tank to plug an airline into. When my brother started driving, I made him one of those gladhand airlines using a rubber hose and a dual inflation chuck that locks onto the valve...for the same price as the POS pvc ones the truck stops sell. I can't stand pvc hoses...OK in the summer, but the other 3 seasons they don't want to unroll so you can use them, and then when you're done they don't want to roll back up to put away. Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment https://www.bigmacktrucks.com/topic/53171-tire-air-pressure/#findComment-397283 Share on other sites More sharing options...
70mackMB Posted April 21, 2018 Author Share Posted April 21, 2018 OK, Thank you for commenting. Ricky went to the FMCSA site and couldn't get a good answer. .....Hippy Quote Link to comment https://www.bigmacktrucks.com/topic/53171-tire-air-pressure/#findComment-397285 Share on other sites More sharing options...
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