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Old 08-13-2012
cmillsap
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Quote:
Originally Posted by hooverg View Post
I'm not familiar with the '315'. Is that just a tire or tire/wheel change or what exactly?
Garry,

Here's the specs comparing the 12R22.5 tire to the 315/80R/22.5. using a 315 tire will allow you to run 100#s on the steer instead of 115#s using the 12R. Those inflation rates work with a 14,600# axle. 15 less pounds in the front tires will definately make for a smoother and less hard or bumpy ride.

Chuck

I tried to copy the tables to this post but the numbers go vertical, so they may be easier to read by going to this website:

http://www.michelintruck.com/micheli...ion-tables.jsp


315/80R22.5 LRL XDN®2 GRIP, XDY® 3, XZA®1, XZA2® Energy™, XZY® 3
PSI

85


90


95


100


105


110


115


120


125


130


Maximum load & pressure on sidewall


LBS
Single

12830


13340


13880


14380


14880


15220


15840


16540


17620


18180


S


9090 LBS at 130 PSI

Dual

23360


24280


25580


26180


27080


27760


28840


30440


32040


33080


D


8270 LBS at 130 PSI


Dual

10600


11000


11600


11880


12280


12600


13080


13800


14480


15000


D


3750 KG at 900 kPa




12R22.5 LRH XDN®2, XDS®, XZE® *, XZY® 3
PSI

75


80


85


90


95


100


105


110


115


120


Maximum load & pressure on sidewall


LBS
Single

10400


10900


11380


12010


12410


12810


13220


13740


14260


14780


S


7390 LBS at 120 PSI

Dual

19960


20760


21560


22700


23140


23580


24020


25060


26100


27120


D


6780 LBS at 120 PSI


Dual

9040


9400


9760


10300


10520


10720


10900


11360


11840


12300


D


3075 KG at 830 kPa
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