How to Find the Correct Tyre Size for Your Car

Fitting the wrong tyre size can affect handling, speedometer accuracy, and even MOT failure. Here's how to find the exact right tyre size for your vehicle.

Using the correct tyre size for your vehicle is not optional — it affects safety, legality, and vehicle performance. Here's how to find the right size every time.

Method 1: Check Your Current Tyres The easiest way is to read the code from your existing tyres. Look for a number sequence like 205/55 R16 on the sidewall.

Method 2: Check the Door Jamb Sticker Most vehicles have a sticker inside the driver's door (or on the fuel cap) showing the recommended tyre size and inflation pressures.

Method 3: Vehicle Handbook Your owner's manual lists the approved tyre sizes for your specific model and trim level.

Method 4: Registration Plate Lookup Many online tyre retailers offer tyre size lookup by number plate, which retrieves OEM specifications for your exact vehicle.

Can You Fit a Different Size to Original?

In some cases, plus-sizing (fitting a larger rim with a lower profile tyre of the same overall diameter) is acceptable. However, the overall tyre diameter must remain within 2–3% of the original to avoid: - Speedometer inaccuracy - ABS and traction control calibration errors - Potential MOT failure

What Happens If You Fit the Wrong Size?

• Vehicle pulls to one side
• Incorrect speedometer reading
• Possible rubbing on bodywork or suspension components
• MOT failure

When you book with Eddie's Mobile Tyres, provide your registration number and we'll verify the correct tyre specification for your vehicle before placing an order.