Tyre speed ratings explained

That mysterious letter at the end of your tyre size – the one you’ve probably ignored since buying your car. It’s not just random alphabet soup. Your tyre’s speed rating could be the difference between a safe motorway cruise and a potential blowout on the A414. Let’s decode what these letters really mean for Hertfordshire drivers.

Speed rating basics: more than just top speed

You’ll find the speed rating (like ‘V’ or ‘H’) after the size on your tyre’s sidewall. But here’s what most people get wrong:

• It doesn’t just indicate maximum speed
• It reflects the tyre’s ability to dissipate heat at speed
• It affects handling characteristics

Local example: That long downhill stretch on the A1(M) near Hatfield? Perfect place to appreciate proper speed-rated tyres.

The complete speed rating chart (simplified)

Surprising fact: Most Hertfordshire drivers could safely use ‘T’ rated tyres – but there’s more to consider.

Three hidden factors beyond the letter

1. Load Capacity – Higher ratings often handle weight better
2. Braking Performance – V-rated tyres stop shorter than H-rated
3. Cornering Stability – Critical for country lanes near Tring

Mobile fitting tip: We always check your vehicle’s original specifications before recommending replacements.

The insurance implications you need to know

Using lower-rated tyres than your car’s specification can:

• Void your insurance in an accident
• Affect warranty coverage
• Reduce resale value

Real case: A Potters Bar driver had a claim rejected after fitting T-rated tyres to a car requiring V-rated.