It describes the tyre’s dimensions and construction: 175 is the width in millimetres, 70 is the profile (sidewall height as a percentage of width), R means radial construction, and 14 is the wheel diameter in inches. To avoid handling, clearance or speedometer issues, match these figures to what is approved for your car, then select the correct load index and speed rating.
Use the vehicle placard (often on the driver’s door shut) or the handbook to find the minimum load index and speed rating required. When buying, you can choose a higher rating, but do not go below the specified minimum. If your car regularly carries passengers or heavier loads, prioritise the correct load index first, then pick a speed rating that meets or exceeds the requirement.
Sometimes, but only if the alternative size is manufacturer-approved and keeps the rolling circumference within a safe tolerance. A different size can affect steering feel, braking performance, arch clearance and speedometer readings. Check the tyre size options on your vehicle placard, confirm wheel width compatibility, and notify your insurer if you change from the listed sizes.
They can be a strong choice if you drive year-round and want one set to handle wet, cold and mild conditions. Look for the 3PMSF symbol if you want improved winter performance compared with standard summer tyres. If you mainly drive in warmer months or want the shortest stopping distances in summer, a dedicated summer tyre may suit better, while frequent winter travel can justify a winter set.
There is no single correct pressure because it depends on the vehicle, axle load and driving conditions. Check the manufacturer sticker for front and rear pressures for normal driving and fully laden use, then set pressures when the tyres are cold. As a rough guide many cars using this size fall somewhere around the high 20s to mid 30s psi, but always follow the vehicle’s stated values for accuracy and safety.
