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Confusion with Old/New Tire Sizes

D

David G

Well-known Member
I have a MH 44 with 13x38 tires and 12" rims on it. I want to replace the tires with the new size. I asked this a while back and was told that the new size would be 15.5x38. I have another tractor with that size and they do not match.

Would the 13.6x38 be the correct tire?
 
After a while they switch the sizes. Like for my H if i wanted to get the orignal 10 in tires i couldn't get em new, have to step up to 11.2 in wide.
 
Reason for the change is the location of measurement has changed. Used to measure rim width, since the 50s it"s been measuring the bulge of the tire- max cross-sectional width. Some say tread width- I don"t believe that because tread width varies with tire design.
 
This is conversion size chart for tire size of the 40's and early 50's vs tire size from the mid 50's to present for bias tires. 8=8.3, 9=9.5, 10=11.2, 11=12.4, 12=13.6, 13-14.9, 14=16.9, 15=18.4, 18=23.1. Example, your old 13 x 38 is equal to a modern 14.9 x 38. A 15.5 was a new size and can be used for a 13 or a 14 old size as it is between the 14.9 and 16.9 size.

Harold H
 

Careful...those 14.9x38" are a Taller tire...in most brands..

Much difference between tire manufacturers as far as width and tire height..

11.2 x38 is no where near as large as the old 10"x38.
If in doubt, go with 12.4x38.
 
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