How to find your tyre size
You can find your tyre size on the sidewall of your current tyre. Look for a code like 205/55 R16 91V. This code shows tyre width, profile, construction, rim size, load index, and speed rating. Your vehicle handbook, door sticker, fuel flap, or registration lookup can also confirm the correct size.
How do you find your tyre size quickly?
You can find your tyre size quickly by checking the tyre sidewall first, then confirming the same size against your vehicle handbook, door sticker, fuel flap, or registration lookup. A tyre code such as 205/55 R16 91V gives the main replacement details. A mobile tyre fitter can use this code to bring the correct tyre.
How do you check the tyre sidewall?
Park the vehicle safely on level ground.
Turn the steering wheel outward if checking a front tyre.
Look around the outer tyre sidewall.
Find a code similar to 205/55 R16 91V.
Take a clear photo before ordering replacement tyres.
The tyre sidewall gives the fastest visible tyre size source. The next check confirms whether the fitted tyre matches the manufacturer recommendation.
How do you check your vehicle handbook or door sticker?
Your vehicle handbook lists the manufacturer-approved tyre sizes for the vehicle model, trim, and wheel option. The door sticker normally sits inside the driver door opening, and some vehicles place tyre information inside the fuel flap, glove box, or under the bonnet.
The handbook and sticker help confirm the fitted tyre size. Registration lookup gives another fast check when the physical markings are difficult to read.
How do you use registration lookup safely?
A registration lookup can match your number plate with common tyre sizes for your vehicle. The lookup may show more than one size when the car has different wheel options, aftermarket wheels, or different front and rear tyres.
The safest process uses registration lookup as a guide and sidewall markings as confirmation.
What does a tyre size like 205/55 R16 91V mean?
A tyre size like 205/55 R16 91V identifies the tyre width, sidewall profile, radial construction, rim diameter, load index, and speed rating. The number 205 means 205mm width, 55 means profile percentage, R16 means radial tyre for a 16-inch rim, 91 means load index, and V means speed rating.
Code Part Meaning Example Value Why It Matters 205 Tyre width 205mm Controls tyre contact width and wheel fitment. 55 Aspect ratio 55% of width Controls sidewall height and ride feel. R Radial construction Radial tyre Shows the tyre construction type. 16 Rim diameter 16 inches Must match the wheel rim diameter. 91 Load index 91 load rating Shows the maximum supported load category. V Speed rating V speed symbol Shows the tyre speed capability category.
What does 205 mean on a tyre?
The number 205 shows the tyre section width in millimetres. A 205 tyre measures about 205mm from one sidewall to the other across the tyre section.
Tyre width affects wheel fitment, steering feel, and clearance. The next number explains the tyre profile.
What does 55 mean on a tyre?
The number 55 shows the aspect ratio or tyre profile. The profile means the sidewall height equals 55% of the tyre width.
A lower profile usually gives a shorter sidewall. The rim code then confirms the wheel diameter.
What does R16 mean on a tyre?
The letter R means radial construction. Most modern passenger car tyres use radial construction.
The number 16 means the tyre fits a 16-inch wheel rim. The load and speed code then confirms safety ratings.
What do 91 and V mean on a tyre?
The number 91 shows the tyre load index. The letter V shows the tyre speed rating.
Tyre load index and speed rating should meet the vehicle manufacturer specification. A lower rating can create safety, insurance, and roadworthiness problems.
Where else can you find the correct tyre size?
You can find the correct tyre size on the tyre sidewall, vehicle handbook, driver door sticker, fuel flap sticker, glove box label, or registration lookup. The tyre sidewall shows the fitted size, while the handbook and vehicle placard show manufacturer-approved sizes. A tyre professional can confirm the correct replacement size.
Source Where To Look Best For Caution Tyre sidewall Outer wall of current tyre Finding the fitted tyre size Markings may be worn or dirty. Vehicle handbook Owner manual tyre section Checking manufacturer-approved sizes Different trims may have different wheels. Door sticker Driver door opening Finding tyre size and pressure Some vehicles place the label elsewhere. Fuel flap Inside fuel filler flap Checking pressure and size guidance Not every vehicle uses this location. Registration lookup Online tyre finder Fast tyre search before buying Aftermarket wheels can affect accuracy.
Where is the tyre size sticker on a car?
The tyre size sticker usually sits inside the driver door opening. Some manufacturers place the tyre placard inside the fuel filler flap, glove box, or under the bonnet.
The sticker may also show recommended tyre pressures. Tyre pressure links tyre size with load and vehicle use.
Where is tyre size shown in the owner’s manual?
The owner’s manual shows approved tyre sizes in the wheels, tyres, or maintenance section. The manual can separate tyre size by engine, trim, wheel diameter, and load condition.
The owner’s manual gives manufacturer context. A fitter can use that context to verify replacement options.
Can a garage or mobile fitter confirm tyre size?
A garage or mobile tyre fitter can confirm tyre size from sidewall markings, vehicle data, wheel diameter, and tyre condition. A clear photo of the tyre sidewall helps the fitter check the code before arrival.
Professional confirmation reduces wrong-stock risk. Registration lookup still helps start the search.
Can you find tyre size by registration number?
You can find tyre size by registration number through an online tyre lookup tool. The tool matches your vehicle registration with likely tyre sizes from vehicle data. Registration lookup saves time, but drivers should still check the tyre sidewall because aftermarket wheels, optional wheel sizes, and staggered fitments can change the fitted size.
Why is registration lookup useful?
Registration lookup helps drivers find tyre options without manually reading every sidewall marking. The tool usually asks for a registration number and postcode before showing available tyres.
Lookup tools support quick ordering. Manual checks remain necessary when wheel options vary.
Why should you still check the tyre sidewall?
The tyre sidewall shows the tyre currently fitted to the vehicle. Registration data may show several approved sizes for the same model.
Aftermarket alloy wheels can create a mismatch between database results and fitted tyres. The next check covers different front and rear sizes.
Can front and rear tyres be different sizes?
Front and rear tyres can be different sizes on some vehicles when the manufacturer uses a staggered fitment. Performance cars may use wider rear tyres for handling and traction. Tyres on the same axle should match in size and specification because mixed axle sizes can affect braking, steering, stability, and road safety.
Why do some cars have different front and rear tyre sizes?
Some vehicles use wider rear tyres to support traction, weight balance, and performance handling. BMW M models and other performance vehicles often use staggered tyre setups.
The vehicle handbook should confirm approved front and rear sizes. Same-axle matching remains the key safety rule.
Why should tyres on the same axle match?
Tyres on the same axle should match in size, structure, and rating. A mismatch can affect braking balance, steering response, and electronic safety systems.
Same-axle checks reduce fitment risk. Worn markings create a different verification problem.
What should you do if your tyre size markings are worn or unclear?
You should check another tyre on the vehicle, inspect the door sticker, read the owner’s manual, use a registration lookup, and send clear wheel and tyre photos to a tyre professional. Drivers should not guess tyre size from wheel appearance because width, profile, load index, and speed rating are not visible from distance.
How can you check another tyre on the vehicle?
Another tyre on the same axle may show a readable size code. The opposite-side tyre often carries the same axle size on standard fitments.
Front and rear tyres may differ on staggered vehicles. A photo checklist helps avoid that mistake.
How can photos help a mobile tyre fitter confirm the size?
Send one close photo of the tyre sidewall code.
Send one full photo of the wheel and tyre.
Send the vehicle registration number.
Send the tyre position, such as front left or rear right.
Send your postcode for fitting availability.
Photos give the fitter visual proof of the tyre position and code. Professional confirmation becomes necessary when no source gives a clear answer.
When should you ask a tyre professional?
You should ask a tyre professional when the sidewall is unreadable, the vehicle has aftermarket wheels, the front and rear sizes differ, or the registration lookup shows multiple options. A trained fitter can verify rim diameter, tyre code, and safe replacement options.
Professional advice matters most when drivers consider a different tyre size.
Can you use a different tyre size on your car?
You can use a different tyre size only when the tyre remains compatible with the wheel rim, vehicle clearance, load rating, speed rating, and manufacturer guidance. A different tyre size can affect handling, braking, suspension clearance, rolling circumference, speedometer accuracy, TPMS behaviour, insurance compliance, and MOT roadworthiness.
Why does wheel rim size matter?
Wheel rim size controls whether a tyre can physically fit the wheel. A 205/55 R16 tyre fits a 16-inch rim, not a 17-inch rim.
Rim mismatch prevents safe fitting. Size changes also affect vehicle behaviour.
How can changing tyre size affect safety?
Wider tyres can reduce arch clearance.
Taller profiles can affect suspension clearance.
Lower load ratings can reduce safe carrying capacity.
Lower speed ratings can breach manufacturer specification.
Incorrect sizes can affect braking and stability systems.
Safety changes connect directly with rolling circumference. Rolling circumference then affects speedometer accuracy.
How can changing tyre size affect speedometer accuracy?
Changing tyre size can change rolling circumference. Rolling circumference controls how far the vehicle travels per wheel rotation.
A larger or smaller rolling circumference can make the speedometer read differently from actual road speed. Tyre size changes should be checked by a tyre professional before fitting.
Why is the correct tyre size important before mobile tyre fitting?
The correct tyre size helps a mobile tyre fitter bring the right replacement tyre, valve, balancing equipment setup, and service plan to your home, workplace, or roadside location. Wrong tyre size can delay fitting, create wrong-stock issues, increase callout complexity, and prevent the fitter from completing the job safely.
How does tyre size help the fitter bring the right tyre?
Tyre size tells the fitter the required width, profile, rim diameter, load index, and speed rating. The fitter uses the code to select compatible stock before travelling.
Accurate size information saves time during booking. Booking details should include more than the tyre code.
What details should you send before booking?
Tyre size code, such as 205/55 R16 91V.
Vehicle registration number.
Tyre position, such as front left or rear right.
Postcode and fitting location.
Clear tyre sidewall photo.
Locking wheel nut key availability.
TPMS warning light status, if visible.
Complete booking details reduce errors. Wrong details can stop the fitting visit.
What happens if the tyre size is wrong?
A wrong tyre size can stop a mobile fitting because the tyre may not match the rim, load rating, or vehicle specification. The fitter may need to reorder stock or reschedule the visit.
Correct tyre size creates a cleaner booking path. The next block moves users from checking to booking.
Need tyres fitted at home, work, or roadside? Check your tyre sidewall code, take a clear photo, and book a mobile tyre fitting service for correct tyre size replacement. Call or request a fitting slot today.
FAQs about finding your tyre size
How do I find my tyre size?
You can find your tyre size on the sidewall of your current tyre. Look for a code such as 205/55 R16 91V. The code gives tyre width, profile, construction, rim diameter, load index, and speed rating. Your vehicle handbook, driver door sticker, fuel flap, and registration lookup can also help verify the correct replacement tyre size.
Where is tyre size written on a tyre?
Tyre size is written on the tyre sidewall. The sidewall is the outer side of the tyre between the tread and the wheel rim. The tyre size usually appears as a large code such as 205/55 R16 91V. Dirt, kerb damage, or tyre age can make markings harder to read, so a torch and close photo can help.
What does 205/55 R16 91V mean?
205/55 R16 91V means the tyre has 205mm width, a 55% profile, radial construction, a 16-inch rim fitment, load index 91, and speed rating V. Each part controls a different fitment attribute. Width and profile affect tyre dimensions, R16 controls wheel compatibility, and 91V confirms load and speed categories.
Can I find tyre size by registration?
You can find tyre size by registration through an online tyre lookup tool. The tool matches your vehicle registration to likely tyre sizes. Drivers should still check the sidewall because optional wheels, aftermarket alloys, and staggered fitments can create multiple possible sizes. Registration lookup works best as a fast starting point, not the only check.
Can front and rear tyres be different sizes?
Front and rear tyres can be different sizes on vehicles with staggered fitments. Performance vehicles may use wider rear tyres for handling and traction. Tyres on the same axle should match in size and rating. A driver should check both front and rear sidewalls before ordering replacement tyres or booking mobile tyre fitting.
Can I use a different tyre size?
You can use a different tyre size only when the tyre remains compatible with the rim, clearance, load rating, speed rating, and manufacturer guidance. Changing tyre size can affect handling, braking, speedometer accuracy, TPMS behaviour, insurance, and MOT roadworthiness. A tyre professional should confirm any alternative size before fitting.
What if my tyre markings are worn?
You should check another tyre, the door sticker, the fuel flap, the owner’s manual, and a registration lookup when tyre markings are worn. A mobile tyre fitter can also confirm the size from clear photos and vehicle details. Drivers should not guess tyre size because width, profile, load index, and speed rating are specific safety values.
What tyre size do I need for mobile tyre fitting?
You need the tyre size fitted to the wheel that requires replacement. A mobile tyre fitter usually needs the tyre code, vehicle registration, tyre position, postcode, and sidewall photo. The tyre code helps the fitter bring the correct stock. The tyre position matters because some vehicles use different front and rear tyre sizes.
Is tyre size the same as wheel size?
Tyre size is not the same as wheel size. Tyre size includes width, profile, construction, rim diameter, load index, and speed rating. Wheel size mainly refers to the rim diameter and wheel fitment. A 205/55 R16 tyre includes a 16-inch rim requirement, but the full tyre code contains more safety and compatibility data.
What happens if I use the wrong tyre size?
The wrong tyre size can affect wheel fitment, braking, steering, suspension clearance, speedometer accuracy, TPMS operation, and roadworthiness. A tyre that does not match the rim diameter cannot be fitted safely. A tyre with the wrong load or speed rating may not meet the vehicle specification. Professional verification prevents unsafe replacement choices.