R speed tires are rare but can be found on some heavy duty light truck lt tires as well as studdable and studless winter tires.
Light truck tire load rating chart.
For example a light truck tire with a load index of 120 116 means a load capacity for a single tire of 3 086 pounds and a load capacity of 2 756 pounds for two tires.
The speed rating system as it is used today was developed in europe.
A tire s load rating is specified by one of the various tire industry standardizing organizations around the world.
Speed symbol the speed symbol also known as the speed rating denotes the maximum speed at which the tire can carry the load indicated by load index li under service conditions specified by a tire manufacturer.
This is because light truck tires are often used on vehicles with dual rear wheels.
This is true whether the tire is a passenger type or light truck type tire said bob toth director industry relations for goodyear.
Still you should always choose tires with a speed rating that is higher than the top speed of your vehicle.
If your tires indicate higher max air pressures than the max load carrying air pressure of the tire a tire expert may need to weigh in to make sure the tire being used can handle the weight requirements of the vehicle.
Both have a 4 ply rating but the extra load can support additional load at up to 42 psi while the standard load is 36 psi.
If you see ply rating and load range on a chart they both represent the tire s maximum load carrying capacity at maximum allowable air pressure.
Tire speed rating or the speed index symbol specify the top speed at which the tire can carry a load corresponding to its load index under service conditions specified by the manufacturer.
To select the right load and inflation table for your commercial tires locate your tire size then match your tire s sidewall markings to the table with the same sidewall markings.
All tires big and small have a recommended load rating.
When it comes to light trucks the load rating is perhaps more important than the speed rating as trucks don t reach high top speeds.
Light truck tires have two load indexes on the sidewall of the tire unlike passenger tires which only have one.
The speed rating is identified as a part of the tire size designation or the tire s service description together with the load index.
Passenger tires feature named load ranges while light truck tires use load ranges that ascend in alphabetical order letters further along in the.
S an s speed rating indicates the tire has been approved for speeds up to 112 mph 180 km h under optimal conditions.
The values of load index vary for the passenger tires and the light truck tires range usually from 70 to 110.
The latest load and inflation table standards michelin continually updates its product information to reflect changes in industry standards so you can stay informed.
