225/40 R19 Tyres Explained

225/40 R19 is a common tyre size for drivers who want low profile performance and precise handling on 19 inch wheels. The numbers are simple. 225 is the tyre width in millimetres. 40 is the aspect ratio, so the sidewall height is 40% of 225mm (about 90mm). R19 means the tyre fits a 19 inch rim. You'll find this size from premium manufacturers such as Michelin and Continental - for example the Michelin Pilot Sport 5 and Continental SportContact 7 in 225/40 R19. mid range options include Hankook, Kumho, Yokohama and Falken. If you're after value there are choices from Wanli, Tomket, Mazzini and Radar. To confirm this is the right size, check the tyre sidewall, the sticker on the driver's door frame or your vehicle handbook. You can also enter your registration for exact matches and recommended load/speed ratings.

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 225/40 R19, this means the following: 225 - the width of the tyre in millimetres. I.e. 225mm wide. 40 - the height of the sidewall as a percentage of the width. In this case 40% R19 - 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 19 inch wheel.

If you are looking for the recommended tyre pressure for 225/40 R19 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 225/40 R19 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 225/40 R19 tyre is calculated by using the profile information of the tyre size. In this instance 40. This tells us that it is 40% 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 225mm, we can work out that the sidewall height is 40% of 225 – this comes to 90mm.