Of course, you should always follow legal speed limits on roadways. Tires with higher speed ratings tend to offer increased handling performance. Replacement tires must have the same or higher speed rating to maintain vehicle speed capability. If a vehicle has tires with different speed ratings, the speed rating of the "slowest" tire dictates the vehicle's top speed.
Like the load index, the speed rating is not required by law to be listed on all tires. If your tires do not have the speed rating listed, your owner's manual will have the relevant information for your model's stock tire type. This indicates that the tire has some capacity to handle snow and mud conditions. This indication is common on most radial or "R" type tires. You may notice another set of letters and numbers on your tire's sidewall beginning with "DOT.
The first two letters or numbers after DOT refer to the manufacturing plant where the tire was produced and the last four numbers indicate the week and year the tire was made. The numbers , for instance, indicate that the tire was manufactured during the 43rd week of While it's certainly possible to upgrade your tires' size, it's usually best to stick to your manufacturer-recommended tire size for optimal performance.
Increasing the size of your tires may give your car more ground clearance, but it may also affect handling, drivetrain performance and fuel economy. Keep in mind the changes to key figures mentioned above, such as load index and speed rating, and how they may affect your vehicle's capabilities if you decide to increase tire size. Once you know how to read the numbers on tires, you can explore tires by size and narrow down your tire options quickly. Compare tire sizes online or visit a Bridgestone tire dealer near you for help.
At the bottom of the table you can see the final recommendation. Depending on the difference of tires, it can be in green or in red. It can put your life in risk while you are driving. Tires calculator. The two-digit number after the slash mark in a tire size is the aspect ratio. The bigger the aspect ratio, the bigger the tire's sidewall will be. Construction The letter "R" in a tire size stands for Radial, which means the layers run radially across the tire.
Wheel Diameter Is the size of the wheel measured from one end to the other. It tells us the size of the wheel that the tire is intended to fit. Load Index Indicates the maximum load that the tire can support when properly inflated.
You'll also find the maximum load on the tire sidewall, in both pounds and kilograms. Learn more about tire load index. Speed Rating Tells you the maximum speed capability of a tire. Often speed ratings are matched to the top speed capability of the vehicle. Goodyear does NOT recommend exceeding legally posted speed limits. Learn more about tire speed rating. Temperature Grades Speeds in mph A Over B Between and C Between 85 and Treadwear grades are based on standardized government tests to help predict the expected treadwear of a tire.
Learn More. Tire Maintenance. How to Put Air in Tires. Tread Depth. This tire is already added to your appointment. Go To Appointment. You can only add one product to your appointment. Adding a new tire will remove the one that you already selected. Not all products fit every vehicle or tire size. Thanks for waiting while our wheels are turning Next, have a tire professional help you determine a tire size range that will fit your vehicle and driving needs. P stands for passenger vehicle tire.
P-class tires include cars, SUVs, crossovers, minivans and smaller pickup trucks. LT means light truck tire , designed for vehicles that are capable of carrying heavy loads, towing trailers, or for those looking for an extra heavy duty option. These are often equipped on three-quarter or 1 ton trucks and SUVs. ST stands for Special Trailer.
These tire sizes are meant for trailers, including fifth wheels and other travel trailers, as well as boat and utility trailers. This may also be referred to as the section width. The aspect ratio is indicated on the tire sidewall as a percentage.
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