12.5 20 michelin tires

[kipman]

I have a question about the 12.5 by 20 michelin tires, my brother oldgrunt has these for his truck, first question, they are 40 inches tall, my 1100-20 are 42 inches tall, the 12.5 is the width, why would these be shorter than my 1100-20?, also, these tires have a max pressure of 55psi, mine are higher than that, can not remember what it is.

 

[rockman]

I guess as a radial, they are shorter and fatter. I run mine at around 45 pounds

 

[atilathehun]

the 11.00x20,s on my m54 say 85 psi cold they are all about 43.5 inch tall

 

[atilathehun]

sorry ndt's not michelins

 

[tsmall07]

Here is a site with specs for all the michelins. The tire pressure should be listed on the sidewall.

Army Military Tires

 

[kipman]

Thanks for the info, big help.

 

[gringeltaube]

.............. they are 40 inches tall, my 1100-20 are 42 inches tall, the 12.5 is the width, why would these be shorter than my 1100-20?.
.................................................

The 12.5 or its equivalent metric size 335/80R20s is a .../80 ratio. That means the sidewall height, measured from bead to thread is 80% of nominal total width being 12.5" wide, mounted. (kind of low profile)
The 11.00-20 as well as the 11.00R20 (and all of the .00 sizes) are /100 which theoretically is sidewall = width.
Actually sizes vary a lot and a general rule is difficult to establish.
9.00-20s should be 9” wide and 38” in diameter but are more like 9.5”x 40.5”. 11.00-20s should be not more than 11.5”x 42” but normally are taller.

G.

 

[kipman]

Great info, now who wants 6 12.5-20 xl michelin tires, my brother wants 1100-20 xl tires.

 

[gimpyrobb]

Crusher is wanting some...

 

[kipman]

I will pm Jeff, These to small for you?

 

[Junkyard Wars Crusher]

Hey thanks for watching my back gimp.

Kip, call me with the deal. (edit: disregard, I just replied to your pm)

 

[gimpyrobb]

Yes Kip, you are correct.