255/45 R20 Tyres Explained

255/45 R20 is a common tyre size for larger cars, SUVs and crossovers. The numbers explain the dimensions. 255 is the tyre width in millimetres. 45 is the aspect ratio, so the sidewall height is 45% of 255mm (about 114.8mm). R20 means a radial tyre that fits a 20 inch rim. You'll find this size on heavier or sportier vehicles where extra width helps handling. Many tyres in 255/45 R20 come as reinforced (XL) or with higher load ratings, and there are EV approved and all season options. This size is offered by premium brands such as Michelin, Continental, Pirelli, Bridgestone and Goodyear. mid range manufacturers include Hankook, Kumho, Yokohama and Falken. Budget alternatives on the page include Royal Black, iLink and Nankang. Popular models you can find in 255/45 R20 include the Michelin Pilot Sport 4 SUV and the Continental PremiumContact 6. Confirm this is correct by checking the tyre sidewall, the driver's door sticker or your vehicle handbook. Or enter your registration for exact matches.

The tyre size that you find on the sidewall of a tyre will tell you important information such as the width, profile and diameter of your tyre. In this case, for the tyre size 255/45 R20, this means the following: 255 - the width of the tyre in millimetres. I.e. 255mm wide. 45 - the height of the sidewall as a percentage of the width. In this case 45% R20 - the diameter of the tyre's inner rim in inches. Basically what size of wheel this is designed to fit onto. In this instance it is a 20 inch wheel.

If you are looking for the recommended tyre pressure for 255/45 R20 tyres, you will find that this will depend on the manufacturer and model. Each vehicle manufacturer has their own tyre pressure recommendation for their model, that will deliver an optimal performance for your vehicle. Check the following if you are unsure what the correct tyre pressure is for your 255/45 R20 tyres Tyre label - this is often the best place to find your tyre pressure information. It is located on the door jamb on the driver’s side of the vehicle. It is a small rectangular label that provides the driver with the recommended tyre pressure and tyre sizes. Vehicle handbook - Quite often the vehicle handbook with contain a section that relates to the technical details for the tyre. This should include the required tyre size, load rating, speed rating and recommended tyre pressure.

The sidewall height of a 255/45 R20 tyre is calculated by using the profile information of the tyre size. In this instance 45. This tells us that it is 45% of the tyre's cross-section width. When looking at a tyre, the sidewall height is the distance between the tread line of the tyre and the rim line. Given that this tyre size has a cross-section width which equals 255mm, we can work out that the sidewall height is 45% of 255 – this comes to 114.75mm.