Quote:
Originally Posted by 509Airborne
275/70R/22.5 They are very new Michelins. The load range thing is where I get a little confused. I am going to need to get it weighed, aren't I?
Thank you for your responses.
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you can search for something like G-load or H-load or LRG or LRH on sidewall, but Michelin also uses J-load/LRJ for AT 125 psi sometimes.
LRH/H-load is AT 120 psi.
LRG/G-load is AT 110 psi.
But if you read something like this on sidewall "maximum load xxxx lbs AT yyy psi ( cold )" that is what you need and overrules the loadrange.
That loadrange is only a way to give the AT-pressure.
I call it AT-pressure because its written on sidewall like that.
Official name is reference-pressure, and is the pressure AT wich the maximum load can be carried up to referencespeed of tire, without overheating any part of the tire.
For your large truckkind of tire, the reference speed is the maximumspeed of tire, and most likely 75m/120km/h wich is speedrate L. you probably find this speedrate also somewhere on sidewall mostly in combination with the loadindex.
Can even be you find 2 sets , for instance right behind the sises 154/152 L
and only for single load a second 156K wich is max speed of tire of 110km/68m/h.
I am able to calculate the needed pressure for you , when not weighed yet I use the GAWR's but better is weighing, but as long as you did not do that , you need a pressure to fill .
Need from tires next and can be found on sidewall.
Maximum load or loadindex
AT-pressure or loadrange(plyrating EUR)
Speedrating.
From vehicle I need next, and some data can be read from the same plate as the pressure advices.
configuration , axles Front , rear TAG, and howmanny tires on the axles,
( 2 tires = single load, 4 tires on axle is Dual load.
GAWR( gross axle weight rating) of the seperate axles
And the maximum speed you use and wont go over for even a minute.
Once you weighed I need the real axle weights , wich are hopefully and most likely lower, higher is not allowed by law but sometimes happens.