Explain Tire sizes to me!
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Senior User
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From: Somewhere, HI
Explain Tire sizes to me!
Okay so I am a newbie with no clue about what I am looking at. After owning cars all my life I pretty much understand the whole MM percentage ratio thing with car tires or the whole 275/75R16 measurement deal. Now that I own a real truck, can someone take a moment to explain real truck tire dimensioning? I mean the whole 33 X 12.5 stuff. I am assuming that this is real American measurements of the heigth and width of the tire but I am not sure. Or could you refer me to a good website that can? I would really appreciate it. It would be nice to understand this. Thanks
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Senior User
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From: Somewhere, HI
Thanks but as I said I understand that. What I need to know is what is the definition of the other types of truck tire measurements such as 33X12.5. Is this standard measurements? What are the standard size ranges for this dimensioning?
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Senior User
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From: Somewhere, HI
Yeah okay so it is in standard inches. I was still not sure about the whole width thing. I will have to measure my tires to see if it is to the middle of the tire. I found a website that I am not done reading that seems to have some pretty good info explaining truck tires.
http://www.tiresafety.com/size_class/size_nav4b.htm
Thanks everyone! Once again you really came through in a hurry!
http://www.tiresafety.com/size_class/size_nav4b.htm
Thanks everyone! Once again you really came through in a hurry!
Elder User
Joined: Feb 2003
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From: Coleman, Wisconsin
Originally posted by 71and72F100s
12.50 means from the edge of the wheel to middle of the tread.
12.50 means from the edge of the wheel to middle of the tread.
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Postmaster
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From: USA
It is the overall width of the tread, as I understand it. If it was from the edge of the wheel to the middle of the tread, your wheels would be two feet wide!! The distance from bead to bead will vary depending on what size rim you have them mounted on. Typically a 12.50" wide tire is mounted on a 10" wide wheel. Yes, all measurements are made in Standard (inches).
33x12.50-15LT The first number is diameter. Second width. Last, rim diameter. LT stands for Light Truck. Where you find a 'C', 'D', or 'E', that is the load range, or weight-carrying rating of the tire.
33x12.50-15LT The first number is diameter. Second width. Last, rim diameter. LT stands for Light Truck. Where you find a 'C', 'D', or 'E', that is the load range, or weight-carrying rating of the tire.
Last edited by SoCalDesertRider; Feb 11, 2004 at 07:17 PM.
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Posting Guru
Joined: Sep 2002
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From: San Antonio, Texas
Originally posted by xlt70black
TIRE SIZE
275 is the width in metric measure
75 is the height of the sidewall wich is 75% of the width
and 16 is no doubt the rim size.
TIRE SIZE
275 is the width in metric measure
75 is the height of the sidewall wich is 75% of the width
and 16 is no doubt the rim size.
Because when my dad got new tires for his truck he went from 235 to 255 and they were taller, they were both 75 16R
Posting Guru
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From: Vancouver WA
No, the first number (235, 255, etc...) is the width. The 75 is a percentage of the width, not a specific height measurement. They are taller because 75% of 255mm is more than 75% of 235mm.
Senior User
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From: Raleigh, NC
Found this on the previously mentioned website:
Light Truck High Flotation:
31X10.50R15LT
31 Approx. Tire diameter in inches
10.50 Approx. Section width in inches
R Radial construction
15 Rim diameter in inches
LT Light Truck designation
Light Truck High Flotation:
31X10.50R15LT
31 Approx. Tire diameter in inches
10.50 Approx. Section width in inches
R Radial construction
15 Rim diameter in inches
LT Light Truck designation
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