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Information & Safety
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SUFFIX LETTERS USED BY THE TIRE AND RIM ASSOCIATION IN TIRE SIZE DESIGNATIONS
AND THEIR DEFINITIONS
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Suffix letters are included, when necessary, as part of Tire Size Designations to differentiate
between tires for service conditions which may require different loads and inflations and/or tires.
which musEbe used on different types of rims. Example: 7.50-15LT. 7.50-15NHS, 7.50-15TR.
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TRUCK-BUS |
- LT - Light Truck tires for service on Trucks. Busses. Trailers and Multipurpose Passenger
Vehicles used in normal highway service.
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- TR - Tires for service on Trucks. Susses and other vehicles with rims having specified
rim diameter of nominal plus 156" or plus 250" This suffix Is intended to differentiate
among tires for Passenger Car, Light Truck, and olher vehicles or other services,
which use similar designations.
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- ML - Mining and Logging tires used in intermittent highway service.
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- MH - Tires for Mobile Homes.
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- HC - Identifies a heavy duly tire designated for use on "HC" 15 tapered rims used on
Trucks, Busses, and other vehicles This suffix is intended to differenliale among tires for
Light Trucks and other vehicles or olher services, which use a similar designation.
Example 8R17.5 LT. 8R17.5 HC.
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- ST - Special tires for Trailers in Highway Service.
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OFF-THE-ROAD |
- NHS - Not for highway service.
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- TG - Tractor-Grader tires - Not for highway service.
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- K - Compactor tire for use on 5" drop center or semi-drop center rims having bead seats
with nominal minus .032 diameter.
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AGRICULTURAL |
- NHS - Not for Highway service.
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- SL - Service limited to Agricultural usage.
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INDUSTRIAL |
- NHS - Not for Highway service.
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- SS - Differentiates tires for off-highway vehicles such as mini and skid-steer loaders from
other tires which use simitar size designations such as 7.00-15TR and 7.00-15NHS. but
may use different rim bead seat configurations.
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CYCLE |
- M/C - Identifies llres and rims for motorcycles.
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LOAD RANGE DESIGNATION - PLY RATING EQUIVALANCE TABLE
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LOAD RANGE |
PLY RATING |
LOAD RANGE |
PLY RATING |
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A |
2 |
G |
14 |
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B |
4 |
H |
16 |
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C |
6 |
J |
18 |
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D |
8 |
L |
20 |
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E |
10 |
M |
22 |
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F |
12 |
N |
24 |
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WARNING
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The task of servicing Tires and wheels can be extremely dangerous and should be performed by trained personnel only, using the correct tools and following specific procedures. Failure to heed this warning could lead to serious injury or death. Read and understand the “safety information” in
we urge that the following is mandatory reading for all those involved in the servicing of Tires and wheels:
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Department of labor occupation safety and health Administration (OSHA) 29 CFR part 1910.177, titled servicing of single piece and multi-piece rim wheels note: single piece rims have a rim made out of a single piece of material as shown on page 321 and multiple-piece rims have a loose flange or flanges and lock ring as depicted on pages 321 and 322.
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- Rubber Manufacturers Association, “Care and Service of Farm Tires”
- Rubber Manufacturers Association, “Care and Service of Off-the-Highway Tires”
- Rubber Manufacturers Association, “Care and Service of Highway Truck Tires”
- Rubber Manufacturers Association, “Demounting and Mounting Procedure Wall Charts:
- Automobile and light truck Tires on single piece Rims
- Truck Tires (Radial and Bias Ply)
- Truck/Bus Tires
- Agricultural Tires
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If you have any doubt about the correct, safe method of performing any step in the demounting, mounting, adding or removing fill, or inflating process STOP! Seek out expert assistance from a qualified person.
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Wear protective gloves, footwear, safety glasses, hearing protection and head gear
when servicing Tires and wheels.
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Further references explaining safety procedures can be found in literature published by the Rubber Manufacturers Association, Washington D.C. ; the tire Association of North America, Washington D.C. ; the national wheel and rim Association, Jacksonville, FL; and OSHA, Washington D.C.
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General Warnings
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Failure to heed warnings could lead to serious injury or death
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the task of servicing Tires and wheels can be extremely dangerous and should
be performed by trained personnel only, using the correct tools, and following the
procedures presented here and in manufacturer’s catalogs, instruction manuals, or
other industry and government instruction material.
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Always use approved tire and rim combinations for sizes and contours
- Always wear personal protection equipment such as gloves, footwear, eye protection, hearing protection and head gear when servicing tire and wheel.
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Never exceed manufacturer’s recommended tire inflation pressure.
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Always use proper lifting techniques, and mechanized lifting aids to move heavy components and assemblies.
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Always take care when moving Tires and wheels that other people in the area are not endangered.
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Never leave a tire, wheel, or assembly unsecured in a vertical position.
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Parts that are cracked, worn, pitted with corrosion, or damaged must be destroyed, discarded, and replaced with good parts.
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Always exhaust all air from the tire prior to demounting.
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Never try to repair wheel, rim, or tire component parts replace all damaged, worn, or suspect parts with good parts.
- Never reinflate a tire that has lost air pressure or has been run fl at without determining and correcting the problem.
- When conducting routine tire inspections also conduct a visual inspection of wheel and rim components Always correct any non-conformities.
- Always verify that part numbers and size designation of component parts are correctly matched for the assembly.
- Always place wheel and tire assemblies in restraining devices when inflating Tires.
- Never stand, lean or reach across the potential tire and wheel component trajectory danger
zones, as shown.
- Additional safety information can be found in literature published by the rubber manufacturer’s Association, Washington D.C. ; the national tire dealer and Retreading Association, Washington D.C.; the national wheel and rim Association, Jacksonville, FL ; and OSHA, Washington D.C.
- Always completely deflate the tire (both Tires of a dual tire assembly) by removing the valve core(s) from valve(s) before attempting any demounting or disassembling check the valve stem by running a piece of wire through the stem to make sure it is not plugged.
Note: Under some circumstances, the trajectory may deviate from its expected path. Always
use a safety cage or other restraining device in compliance with OSHA regulations.
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Note: Under some circumstances, the trajectory may deviate from its expected path. Always
use a safety cage or other restraining device in compliance with OSHA regulations.
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