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Home >> Tire School >>  Off-The-Road Tire

Off-The-Road Tire

a.  T.R.A. Classification and application.

Service Vehciles T.R.A. CODE
Loader and Dozer Shovels Loaders Bulldozers L-2
L-3
L-4
L-5
L-5S
Earthmover

Dump Trucks Coal haulers Scrapers

E-3
E-4
E-7
Grader Grader G-2
G-3
Compactor Tire-rollers C-1
C-2
Industrial Mechanical Handling Equipments IND3
IND4
IND5

b.  The different Off-The-Road Tire families.

100 Series ( Narrow Base )

The H/S aspect ratio is approximately equal to 1.00
The section width, given in inches is a whole number
Example: 18.00R25




80 Series ( Wide Base )

The H/S aspect ratio is approximately equal to 0.80
The section width, given in inches is a whole number followed by a fraction
Example: 20.5R25= 525/80R25


65 Series (Low Profile Tires )

The H/S aspect ratio is approximately equal to 0.65
The section width, given in millimeters followed by the number 65

Example: 750/65R25 


 
c.   Comparison of tread depth


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