When selecting replacement tyres, matching the load index and speed rating to your vehicle's requirements is essential for both safety and legality. Fitting tyres with inadequate ratings can compromise handling, affect your insurance, and — in extreme cases — lead to tyre failure. Here's a clear breakdown of what these ratings mean.
What Is the Load Index?
The load index is a two or three digit number that indicates the maximum weight each tyre can safely support when properly inflated. Common values range from 75 (387kg) to 105 (925kg). Your vehicle manufacturer specifies a minimum load index for each axle — fitting a tyre with a lower value means the tyre cannot safely carry the weight placed on it, particularly when the car is fully loaded.
What Is the Speed Rating?
The speed rating is a letter code indicating the maximum sustained speed the tyre is engineered to handle. Common UK ratings include H (up to 130mph), V (up to 149mph), W (up to 168mph), and Y (up to 186mph). It is legal and acceptable to fit a tyre with a higher speed rating than the vehicle requires, but never a lower one.
Finding the Right Rating for Your Vehicle
Your vehicle's recommended tyre specification — including load index and speed rating — is found in the owner's manual, on the door jamb sticker, or printed on the existing tyre sidewall. Always match or exceed both values when selecting replacements.
We'll Identify the Right Tyre for You
When you call 01484 627456, our mobile tyre fitters in Huddersfield will confirm the correct specification for your vehicle and ensure the tyres we bring meet or exceed the manufacturer's requirements.
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