Sidewall Codes: What You Need to Know and How to Read Them

Sidewall Codes on Tires: How to Read Them and When to Seek Professional Advice

Every tire has a unique set of sidewall codes, which contain important details about size, load capacity, speed rating, and manufacturing date. Whether you are driving through Ocala,  or taking a drive on the soon to be expanded  I-75, understanding these markings is, in fact, essential.

Here at Meineke in Ocala, we know that reading tire sidewall codes can seem confusing. Thus, knowing what they mean can help you make informed decisions about tire replacements, maintenance, and safety. So, in this post the pros at Meineke are here to help you better understand the codes on the side of your tires.

How to Read Sidewall Codes on Tires

Each tire’s sidewall codes include a series of letters and numbers that provide specific details about the tire’s specifications. Therefore, breaking them down into sections makes them easier to understand.

• Tire Type – The first letter indicates the type of vehicle the tire is designed for.

  • P – Passenger vehicle

  • LT – Light truck

  • ST – Special trailer

• Tire Width – The first three-digit number represents the tire’s width in millimeters.

• Aspect Ratio – The next two-digit number shows the height of the sidewall as a percentage of the tire’s width.

• Construction Type – The letter after the aspect ratio indicates the tire’s construction.

  • R – Radial (most common)

  • B – Bias-ply

• Wheel Diameter – The next two-digit number tells you the diameter of the wheel in inches.

• Load Index & Speed Rating – The load index shows the maximum weight the tire can handle, while the speed rating indicates the maximum safe speed.

• DOT Code – The Department of Transportation (DOT) code shows where and when the tire was manufactured. The last four digits represent the week and year of production.

What Sidewall Codes Mean for Your Tires

Sidewall codes provide critical information about tire performance, safety, and compatibility. Therefore, understanding these numbers can help you:

• Ensure Proper Tire Fitment – Matching the correct width, aspect ratio, and diameter ensures a proper fit for your vehicle.

• Check Speed and Load Limits – Following the correct load index and speed rating ensures safety and efficiency.

• Monitor Tire Age – Knowing when your tire was manufactured helps you determine when it’s time for a replacement.

• Choose the Right Tires for Driving Conditions – Selecting the right construction type and tread pattern improves performance based on road conditions.

If you are unsure what your sidewall codes mean, then checking your owner’s manual or consulting a professional mechanic at Meineke is, in fact, the best way to ensure proper tire selection.

When to Seek Professional Advice at Meineke in Ocala, FL

While reading tire sidewall codes is helpful, certain situations require professional expertise. If you are unsure about your tires, then call Meineke in Ocala, FL for expert tire service when:

• Your Tires Are Over Six Years Old – Tires degrade over time, thus increasing the risk of failure.

• You See Uneven Tread Wear – Irregular wear patterns indicate alignment or pressure issues.

• Your Sidewall Shows Cracks or Bulges – Damage to the sidewall can lead to sudden tire failure.

• You Experience Vibration or Poor Handling – This could indicate an issue with tire balance or tread wear.

• You Are Replacing Tires and Need Guidance – Choosing the wrong tire specifications can impact performance and safety.

If your tires show any of these warning signs, then the experts at Meineke on SW Highway 200 in Ocala are here to help. Our ASE-certified technicians can inspect, rotate, balance, and replace your tires to keep your vehicle running smoothly.

Visit Meineke in Ocala, FL, for Expert Tire Service

Understanding sidewall codes on tires is essential for choosing the right tires and ensuring vehicle safety. If you need a tire inspection, alignment check, or professional advice, then visit Meineke on SW Highway 200 in Ocala today for expert service.

If the Meineke in Ocala is not a convenient auto repair center for you, here are a few of the many other car repair centers in Florida:

Meineke Car Care - Spring Hill Dr.
14395 Spring Hill Drive
Spring Hill, FL 34609
Call (844) 874-6081

Meineke Car Care - SW Highway 200
6187 SW Highway 200
Ocala, FL 34476
Call (352) 307-1922

Meineke Car Care - So. Orange Ave.
4834 S Orange Ave
Orlando, FL 32806
Call (321) 250-5693