about OTR tires
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
