Ever looked at the sidewall of your trailer tyres and seen a random letter like “L” or “N”?That’s your speed symbol - and it’s more important than you might think.
Let’s decode them properly.
What Is a Speed Symbol?
The Speed Symbol indicates the maximum speed a tyre can safely sustain under its rated Load Index, according to the European Tyre and Rim Technical Organisation (E.T.R.T.O) standards.
Here’s the breakdown:
Speed Symbol | km/h | mph |
J | 100 | 60 |
K | 110 | 69 |
L | 120 | 75 |
M | 130 | 81 |
N | 140 | 87 |
P | 150 | 93 |
Q | 160 | 100 |
R | 170 | 106 |
S | 180 | 113 |
T | 190 | 118 |
U | 200 | 124 |
H | 210 | 130 |
V | 240 | 150 |
So, if your trailer tyre has an L rating, it’s safe for up to 75 mph - but that doesn’t mean your trailer should ever be doing 75 mph!
Trailer Tyre Rules: UK vs. EU
According to E.T.R.T.O. 1991 Section 13, caravans and light trailers can apply a special rule:
This means:
However, this rule only applies within the UK, and not all manufacturers or sectors use it.
So, always check your trailer’s manufacturer guidance - or play it safe and stay under both your load and speed limits.
Why Trailer Speed Symbols Matter
Tyres are your only contact with the road - and if they’re not rated correctly, you’re asking for trouble. Here’s why you need to pay attention to speed symbols:
Legality: The UK’s trailer speed limit is 60 mph, even if your tyres are rated higher - but the tyres still need to meet that speed safely.
Maintenance: Tyres must be correctly inflated for the applied load to keep the combination safe.
Brent’s Take
At Brent, we’re all about towing smart - not just fast.
Understanding your trailer’s tyre speed symbols helps you stay safe, compliant, and confident every time you hitch up. It’s not the sexiest part of trailer ownership, but it’s the bit that keeps your wheels - literally - on the road.
If you’re ever unsure, check your tyre markings or ask your local hire outlet. And if your current setup looks a bit tired (pun intended), you can always find road-ready trailers on Brent.
Tow safe. Tow smart. Tow with Brent.
-Master Brent
