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Tire Ratings and Tire Safety
Load Range
This information identifies the tire's load-carrying capabilities and its inflation limits. Load range differs from Load index in that it measures how much load can be put on a tire horizontally or how much stress the tire can take from side to side. If you use your vehicle to tow with then you should be particularly interested in knowing your load range because the vehicle will generally wander or wallow back and forth creating a lot of stress on the tire’s sidewalls. Other conditions that will test a tires load range are wind that is often confronted while driving on long stretches of interstate highways, higher or high speed driving, weight of load and type of vehicle that is drive. Wind can have the same effect on the tires as towing because it causes the vehicle to behave the same way. Top heavy vehicles such as SUV’s and four wheel drive trucks will also put pressure on the sidewall of tires when cornering especially at higher speeds and especially so when these vehicles are carrying a heavy load. Below is a chart that shows load and their corresponding ply (these are explained under the next heading) ratings passenger vehicle and light trucks.
• Note: LT-metric, LT-Flotation and LT-numeric tires will be branded with their load range ("Load Range E" or "LRE") or their ply rating ("10 Ply Rated") on their sidewalls and list their appropriate load range letter in their descriptions as LT245/75R-16E, 7.50R-15D or 31x10.50R-15C.
• ST-metric sized special trailer service tires will be branded with their load range ("Load Range D" or "LRD") on their sidewalls and lists their appropriate load range letter in their descriptions as ST205/75R15 LRD.
Load Range and Load Pressure for Passenger Tires
|
Load Range |
Load Pressure (psi) |
P-metric |
Light Load
Standard Load
Extra Load |
35
35
41 |
Euro-metric |
Standard
Reinforced/Extra Load |
36
42 |
Load Range, Ply Rating and Load Pressure for Light Truck Tires
|
Load Range |
Load Pressure (psi) |
P-metric |
Light Load
Standard Load
Extra Load |
35
35
41 |
Euro-metric |
Standard
Reinforced/Extra Load |
36
42 |
Load Range, Ply Rating and Load Pressure for Light Truck Tires
|
Load Range |
Load Pressure (psi) |
P-metric |
Light Load
Standard Load
Extra Load |
35
35
41 |
Euro-metric |
Standard
Reinforced/Extra Load |
36
42 |
Source: Tirerack.com
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