245 is the tyre width in millimetres, 35 is the sidewall height as a percentage of that width, and R18 is the wheel diameter in inches. Because the 35 profile is relatively low, steering typically feels more direct, but the ride can feel firmer and the wheel is more exposed to pothole damage. Choosing a quality tyre and keeping pressures correct makes a noticeable difference with this size.
Many 245/35 R18 tyres are XL (extra load), but you should only choose the specification that meets or exceeds your car’s required load index and speed rating. Check the tyre label on your current tyres or the vehicle placard (often in the door shut or fuel flap). Do not downgrade from XL to a standard load tyre if your vehicle requires XL.
It is possible on some cars, but the overall diameter of 245/35 R18 is around 4% smaller than 245/40 R18, which can affect speedometer accuracy, ground clearance and suspension geometry. It can also change the way traction control and ABS behave. Only switch if it is an approved fitment for your exact model and wheel width, and consider checking with your insurer if your car is modified.
Yes, but the range can be narrower than more common sizes because 245/35 R18 is often used on performance-focused setups. For winter use, look for tyres marked with the 3PMSF symbol for verified snow performance. If you want one set for year-round UK driving, an all-season pattern can be a practical choice, provided it matches the required load index and speed rating.
Use the pressures recommended by your vehicle manufacturer, as they vary by car weight, axle load and whether the car is carrying passengers or luggage. With a 35 profile, correct pressure is especially important for stability, wear and avoiding wheel damage. Check pressures when the tyres are cold, and recheck after fitting and whenever temperatures change significantly.
