1 X 255 45 20 POWERTRAC ECOSPORT X77 255/45ZR20 105Y XL TYRE M+S 5MM

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1 X 255 45 20 POWERTRAC ECOSPORT X77 255/45ZR20 105Y XL TYRE M+S 5MM - part number 255 45 20

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About part number 255 45 20

A tyre is the rubber cover fitted around the wheel rim to provide grip, steering control, and braking force on the road surface. As part of the wheel and suspension system, it connects the vehicle directly to the road, absorbing small bumps and transferring acceleration and braking. When a tyre is working correctly, the driver experiences a smooth, quiet ride with predictable handling and secure road holding in various weather conditions.

To check if this tyre is the correct size for your vehicle, you must match the full specification number 255 45 20. This sequence of numbers is raised or moulded directly onto the outer sidewall of the tyre. Matching these exact numbers is what decides whether a tyre will fit your wheel rim correctly and safely.

When replacing a tyre, a technician usually fits a new rubber valvesystem and balances the wheel assembly with small weights to prevent vibration. Tyres are commonly replaced due to tread wear, sidewall damage, punctures, or natural ageing of the rubber compound over time.

  • Part type: Tyres.
  • Specification: unit quantity 1; rim diameter 20; tyre width 255; aspect ratio 45.

About this kind of part: tyres

A tyre is described by the code moulded into its sidewall: the section width in millimetres, the aspect ratio as a percentage of that width, the letter R for radial construction, the rim diameter in inches, and then the load index and the speed symbol. A code such as 245/40R19 95Y names a tyre that will fit a 19 inch rim of a suitable width. The sidewall also carries the four-digit week and year it was made, the approval marks, and any manufacturer code for a car maker's own specification.

Why people replace one

  • The tread has worn to the legal limit, or the wear is uneven because the alignment is out.
  • A single tyre has been damaged by a kerb, a pothole or a puncture in the sidewall, where a repair is not permitted.
  • One of a set is wanted to match the three already on the car, because mixing patterns across an axle changes how the car behaves.
  • A seasonal change, where a summer set and a winter set are swapped twice a year.
  • A car has come with mismatched tyres and the owner wants the pattern and the specification to match.

Fitting it

  • A tyre must be fitted by a tyre fitter with the proper machine, balanced on the wheel, and inflated to the pressure on the car's own placard.
  • The valve is normally replaced whenever a tyre is changed, and a wheel with pressure monitoring needs its sensor refitted and checked.
  • Direction matters on a directional pattern and so does the inner and outer face on an asymmetric one. Both are marked on the sidewall.
  • Tyres should match across an axle in size, pattern and specification, and a car with four-wheel drive is usually specified to match on all four.

Making sure it is the right one

  • Read the full code off your own sidewall and match every element of it. The width and the diameter are not enough on their own: the aspect ratio, the load index and the speed symbol all have to be suitable for the car.
  • Check the date code. A tyre is a rubber product and ages whether or not it has been used, so the week and year on the sidewall is part of what you are buying.
  • Look for a manufacturer's own marking if your car carries one. Some cars are specified with a tyre built to the car maker's requirement, and the marking on the sidewall is how that is identified.
  • Measure the tread yourself from the photographs where the depth is shown, and treat the pattern as part of the match rather than a detail.

What to look for in the photographs

A Size code — The width, aspect ratio, construction letter and rim diameter moulded into the sidewall. Match every element, not just the first two.
B Load index and speed symbol — The number and letter after the size. These have to be suitable for the car, and a lower rating is not a saving.
C Date code — Four digits in an oval: the week and the year of manufacture. A tyre ages in storage as well as on the road.
D Tread depth — Read it in the main grooves across the whole width, not at one point. Wear at the edges and wear in the centre mean different things.
E Manufacturer marking — Any letter or symbol denoting a car maker's own specification. If your sidewall has one, it is part of the match.
F Sidewall and bead — Look along the whole sidewall for cuts, bulges or kerb scuffing, and at the bead where it seats on the rim.

This section describes tyres parts in general. The numbers and the photographs above are this part.

Free next-day delivery in the United Kingdom Sent with DPD on a tracked, next-day service. Most mainland addresses are next day; the Highlands and Islands, Northern Ireland, the Channel Islands and the Isle of Man can take a day longer.

Returns Thirty days to change your mind, and we pay the return postage in the United Kingdom and Germany.

Trade and VAT C.E.J Haime Group Limited is VAT registered in England and Wales, and every order comes with a full VAT invoice.

Not sure it is the right part? Send us your registration or VIN and we will check this part number against your own vehicle before you buy.

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