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What size of tire is a 380/80/R38

D

dhermesc

Well-known Member
A place has these advertised as replacements for 11.2, 12.4, 13.6, 14.9 and 15.5 38 inch tires.

I need a set of 13.6X38 in the worst way.
 
The 380 is the width of the tire in millimeters. That would be 380mm. That figures out to 15 inches.

The 80 is the proportion of width to height. In this case, the with is 80% of the height.

The 38 is the rim size in inches. The R means it is of radial construction.
 
You need something like a 350-80R-38. I really don't like these metric sized tires. I've worked SO long with the new and old inch sized tires.
 
No, I had it right. Look at the new low profile tires that come on some new cars. 40 series, 59 series, and the like. Notice how little sidewall they have and how short and fat they look. Height is 40 or 50 per cent of width. Then look at an 80 series tire. It will be tall and skinny in appearance. Height is 80% of width.
 
Talk about a dumb way to measure a tire. Why the heck didn't they just make the height in mm or inches? Then they throw in imperial measurements for the rim size for good measure! Just dumb!
 
The width/ratio/rim dimension scheme is actually quite informative as it gives you everything you need to determine the tire size in every direction, even if it does require a calculator. With the older width-rim dimension that we're all familiar with for tractors the overall diameter isn't part of the size description. For example, a 14.9-38 and a 15.5-38 tire are about the same diameter (the 15.5 actually being shorter) but nothing in the description would tell you that. With the width/ratio/rim description the 15.5 would have a smaller number for the aspect ratio and you would know at a glance that it had a lower profile in relation to its width. Automotive tires have been measured this way for decades and in the past 20 years or so the system has been adopted for other types of tires.

Rim diameters are nearly always measured in inches, even in countries where everything else is in metric units. There are very few rims out there with a metric diameter and applications are mostly limited to a small number of older (mid-80's) European cars such as some BMW's.
 
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