The most common tyre size on UK roads is 205/55R16, but that's a starting point, not an answer. There are many variations, so it's important to check your existing tyre first before searching. Get it wrong and you risk a £2,500 fine per tyre, points on your licence, and a car that doesn't handle the way the engineers intended. Get it right, and a new set should run you somewhere between £200 and £600 fitted, depending on size and brand.
This guide walks you through finding the exact tyre your car needs, what every number on the sidewall means, and which type of rubber suits how you actually drive.
Where to find your tyre size in 30 seconds
There are four places to look, and any one of them will tell you what you need.
- The tyre sidewall. You can find the current tyre size on the sidewall of your tyre. Look for a string like 205/55 R16 91V.
- Inside the driver's door jamb. Most cars have a small white sticker showing recommended sizes and pressures.
- Inside the fuel filler flap. Common on VW Group cars (Audi, Skoda, SEAT) and many others.
- The owner's handbook. The tyre section lists every approved fitment for your model.
If you can't get to the car, plug your number plate into a registration lookup tool at Halfords, Kwik Fit, Blackcircles or any major retailer. One important warning: some vehicles come with different tyre sizes for the front and rear, so check both before making a replacement. Mercedes, BMW and many performance cars do this routinely.
Decoding the sidewall: what 205/55 R16 91V actually means
It looks like a maths exam. It isn't. Read left to right:
- 205: the width of the tyre in millimetres, from sidewall to sidewall.
- 55: the aspect ratio, meaning the profile height of the sidewall is 55% of the tyre width.
- R: radial construction, which is what almost every modern car uses.
- 16: the wheel rim diameter in inches.
- 91: the load index, a coded number for the maximum weight each tyre can carry.
- V: the speed rating. A V-rated tyre can safely carry its maximum load at a top speed of 148 mph.
You may also spot extras. If your vehicle needs to support a heavy load with higher inflation pressure, look out for RF (reinforced) or XL (extra load). Runflat tyres, common on Minis and BMWs, let you keep driving for a limited distance after a puncture.
Why you should never downgrade the speed or load rating
It's tempting to save £20 a corner by buying a lower-spec tyre. Don't. Choosing a lower speed rating than that recommended by your vehicle manufacturer could potentially invalidate your insurance. The same applies to load index, which matters most on vans, estates and anything that regularly tows.
Continental sums it up cleanly: replacement tyres must never be of a smaller size or load-carrying capacity than the original specification. You can go higher, you cannot go lower.
Summer, winter, all-season or EV-specific?
Once size is sorted, the next decision is type. Most UK drivers default to summer tyres, but that's not always the smartest pick.
Summer tyres
Best grip in warm, dry and wet conditions above roughly 7°C. They harden and lose grip when temperatures drop, which in the UK means roughly November to March.
Winter tyres
Made from a softer compound with deeper, siped tread. Designed with specialised tread patterns and compounds, winter tyres are the safest option from October to March, when temperatures drop and conditions become challenging. If you live somewhere rural, hilly, or just commute year-round, they pay for themselves the first time you avoid sliding into a hedge.
All-season tyres
A compromise that suits most urban UK drivers. They carry the 3PMSF (three-peak mountain snowflake) marking if they're genuinely winter-rated, and they save the faff of swapping rubber twice a year.
EV-specific tyres
Electric cars are heavier and produce instant torque. EV tyres are reinforced, have low rolling resistance to protect range, and use foam inside the carcass to cut road noise. If you drive a Tesla, Ioniq or ID.3 and fit standard rubber, expect them to wear out faster.
Tread depth, age and the law in 2026
Even the perfect tyre is illegal if it's worn out. The legal tyre tread depth limit for cars in the UK and Europe is 1.6mm across the central three-quarters of the tyre, and it must meet this minimum across its complete circumference.
Get caught below that and you risk a fine of £2,500 and three penalty points per tyre. Four bald tyres in one stop could cost you £10,000 and your licence.
Most safety experts push for an earlier replacement. Tests by UK technical organisation MIRA found that the difference in wet braking distance between a tyre worn to 3mm and one worn to 1.6mm can be as much as 44%. That's a couple of car lengths at 60mph, easily the difference between a near miss and a claim.
Age matters too. Even if you drive limited miles each year, tyres should be replaced every five or six years. Rubber perishes whether the car moves or not. The DOT code on the sidewall tells you the manufacture week and year, useful if you're buying part-worns or checking how long a set has been sat on the shelf.
Should you change all four tyres at once?
Ideally yes, but it's not always necessary. The rules of thumb:
- Replace in pairs at minimum, always across the same axle.
- Put the newer, deeper-tread tyres on the rear, even on a front-wheel-drive car. This is industry standard practice because it reduces oversteer in the wet.
- Never mix tread patterns or brands on the same axle.
- If your car is four-wheel drive, check the handbook. Many AWD systems require all four tyres to be within a few millimetres of each other to avoid stressing the differentials.
If only one tyre is damaged and the others have plenty of life left, a single replacement on the same axle as a similarly worn match is fine. Just don't pair a brand-new tyre with one running on 2mm.
Budget, mid-range or premium: where to spend your money
A 205/55R16 in 2026 ranges roughly from £55 fitted for a Chinese budget brand to £140+ for a Michelin Pilot Sport or Continental PremiumContact. Auto Express and What Car? tyre tests consistently show that premium tyres stop shorter in the wet, last longer, and run quieter, though the gap to mid-range brands like Falken, Hankook and Goodyear's value lines has narrowed.
A sensible approach for most drivers:
- City runabout, low mileage: a quality mid-range tyre is plenty.
- Motorway commuter: spend up. Better wet grip and lower rolling resistance pay back in fuel and safety.
- Performance car: stick to the manufacturer-recommended (OE-marked) tyre. The car was developed around it.
- EV: EV-rated rubber, every time.
When you're ready to buy, you can compare local fitters through Fixaroo's find local services tool, or head straight to garages in Manchester, London or your nearest city for fitted quotes. If your tyres are borderline and the MOT is looming, the MOT check tool will tell you exactly when you're due.
Quick checklist before you order
- Confirm size from the sidewall, not just the reg lookup.
- Match or exceed the speed rating and load index.
- Check whether front and rear sizes differ.
- Decide on summer, all-season, winter or EV-specific.
- Budget for valves (£3-5 each), balancing, alignment if needed, and old tyre disposal.
- Book fitting at a reputable local centre rather than the cheapest postcode-distant deal.
Get those six things right and you'll end up with the correct tyres for your car, fitted properly, at a fair price. Cheap rubber on the wrong size rim is a false economy your stopping distance can't afford.