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The Complete Guide to Your Tyre Sidewall
Your tyre's sidewall is packed with information. Understanding these markings is key to choosing the right tyres for safety, performance, and comfort. Let's break it down.
Core Size: The Numbers for Your Search
These are the three essential numbers you'll use in our search form.
Service Description (Load & Speed)
Found after the rim size (e.g., 91V), this tells you the tyre's load and speed capabilities. It's vital for safety to match or exceed your vehicle manufacturer's recommendation.
- Load Index (e.g., 91): This number corresponds to the maximum weight (in kg) a single tyre can carry when fully inflated. A higher number means a higher load capacity.
- Speed Rating (e.g., V): This letter indicates the maximum speed the tyre can safely sustain. For example, 'V' is rated up to 149 mph (240 km/h).
Special Markings (Run-Flat, OE, etc.)
Look for these letters to identify special tyre technologies or recommendations.
- Run-Flat Tyres (RFT): These have reinforced sidewalls that let you drive for a limited distance after a puncture. Markings include RFT, SSR, ZP, ROF, or DSST.
- Original Equipment (OE): Tyres developed for a specific car manufacturer. Markings can include * (BMW), MO (Mercedes), AO (Audi), N (Porsche). Using OE tyres is recommended for optimal performance.
- Winter & All-Season: The Three-Peak Mountain Snowflake (3PMSF) symbol indicates certified winter performance. M+S (Mud and Snow) is a less stringent all-season marking.
Manufacturing & Age (DOT Code)
The "DOT" code is the tyre's serial number. The most important part is the date code at the very end.
- Date Code: The last four digits tell you the week and year of manufacture. For example, 3223 means the tyre was made in the 32nd week of 2023.
- Tyre Age: It is recommended to replace tyres that are over 10 years old, regardless of tread depth, as the rubber compound degrades over time.
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The Complete Guide to Your Tyre Sidewall
Hover over any item in the guide to see what it means and where to find it on your tyre.
Tyre Width (205)
The first three digits show the tyre's width in millimeters from one sidewall to the other.
Aspect Ratio (55)
Indicates the sidewall height as a percentage of the tyre's width. Here, it's 55% of 205mm.
Construction Type (R)
The 'R' confirms the tyre has a Radial construction, the modern standard for cars.
Rim Diameter (16)
The diameter in inches of the wheel rim the tyre is designed to be fitted on.
Load Index (91)
This number corresponds to the maximum weight the tyre can safely support when fully inflated.
Speed Rating (V)
The letter indicates the maximum certified speed for the tyre. 'V' is rated for up to 149 mph.
The Alpha MOT Difference: Service & Guarantees You Can Trust
Lifetime Mileage Guarantee
Drive with complete peace of mind. We're so confident in the quality of our tyres that every new tyre we fit comes with a lifetime mileage guarantee.
All-Inclusive Transparent Pricing
No hidden surprises. The price you see online is the price you pay. Every fitting includes a new valve, professional wheel balancing, and disposal of your old tyre.
Same-Day Fitting
Need tyres urgently? Book online and we can often fit your new tyres the very same day, getting you back on the road safely and quickly.
Expert Advice & Fitting
Our trained technicians are here to help. From choosing the right tyre to expert fitting, we ensure your safety and performance are our top priority.
Frequently Asked Questions About Buying Tyres
How can you tell if you need new tyres?
If you notice any of these signs, it might be time to consider getting new tyres:
- Insufficient tread depth: Use the 20p test to check your tyres’ tread depth. If it’s below the legal minimum of 3mm (or less than the outer rim of a 20p coin), it’s advisable to replace them.
- Cracking: Inspect both the tyre and sidewalls for visible cracks, as they could indicate ageing or potential structural issues.
- Flat tyre: While some slow punctures can be repaired, not all flat tyres can be saved. A professional technician can assess the damage and advise on the feasibility, and legality, of repair.
- Flat spots or balding: This often occurs when a vehicle is stationary for extended periods. The weight of the vehicle can cause bald spots on the tyres, compromising performance and safety.
If you are looking for a car tyre shop or car replacement services in Colchester, then at Alpha MOT and Service Centre, we have got you all covered. It’s essential for your vehicle to be in good condition to move on the road and tyres plays a vital role in this.
Where can I find my tyre size?
Each vehicle has unique tyre sizes. You’ll locate your tyre size imprinted on the rubber on the side of your tyre. Keep in mind that certain vehicles, like BMWs and Mercedes, may have different tyre sizes on the rear compared to the front. Therefore, it’s essential to verify the exact tyre you need replacing.
How many miles do tyres last?
The longevity of a tyre depends on various factors such as the tyre’s quality, driving conditions, driving style, and frequency of use. Tyres wear out due to regular use but can also deteriorate from cracking and perishing during periods of inactivity, particularly in fluctuating temperatures like spring and autumn. As a general guideline, a tyre typically lasts approximately 20,000 miles before requiring replacement due to normal wear and tear.
Do front and rear tyres need to match?
It is highly recommended that the type, size, and tread pattern of the front and rear tyres match. This is why we suggest replacing your tyres in axle pairs. Regardless of whether your vehicle is front or rear-wheel drive, if you only need to change one tyre, it should be mounted on the back axle. This helps maintain consistent handling, stability, and traction, reducing the risk of oversteer or understeer in various driving conditions.
Does it matter what tyres you put on your car?
Indeed, utilising the right tyres can substantially improve your vehicle’s handling, grip, and fuel efficiency. It’s essential to understand that tyres are crafted for specific weather conditions and driving styles. We highly recommend consulting your car’s manual or reaching out to the tyre specialists at Alpha MOT Centre in Colchester to ensure you’re equipped with the ideal tyres for your vehicle. Our expertise can guide you in making informed decisions that enhance both performance and safety on the roads.
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