Speed Ratings: What the Letters Mean
The speed rating letter on your tyre indicates the maximum sustained speed the tyre is designed to handle. Common ratings: T = 190km/h (118mph), H = 210km/h (130mph), V = 240km/h (149mph), W = 270km/h (168mph), Y = 300km/h (186mph). UK law requires that replacement tyres must meet or exceed the original equipment speed rating specified in your vehicle manual. Fitting a lower-rated tyre than specified can invalidate your insurance.
Load Index: The Number That Really Matters
The load index is the number preceding the speed rating letter (e.g., 91 in '91V'). It indicates the maximum weight each tyre can safely support. Load index 91 = 615kg; 95 = 690kg; 100 = 800kg; 106 = 950kg. For vans, SUVs, or any vehicle used for carrying heavy loads, ensuring the load index meets or exceeds the original specification is critical. An underloaded tyre specification can cause catastrophic failure under load — particularly at motorway speeds on the M62 or M1.
Can You Use a Higher Rating Than Specified?
Yes — you can always fit a tyre with a higher speed rating or load index than specified. You cannot legally fit one with a lower rating. Many drivers choose to upgrade — for example, fitting H-rated tyres to a car specced for T-rated — for a small performance and safety margin. This is perfectly legal and safe.
Confused About Your Tyre Spec?
Call Leeds Tyre Guys on 0113 234 5678 with your vehicle registration. We'll identify the correct specification instantly from our database and ensure every fitment meets or exceeds OEM requirements.