165 is the tyre width in millimetres, 80 is the aspect ratio (the sidewall height as a percentage of the width), and R13 means radial construction for a 13-inch wheel. This combination gives a relatively tall sidewall, so it is important to match the size exactly to keep the correct rolling diameter and clearance.
Choose a load index and speed rating that meet or exceed the figures listed on your vehicle door placard or in the handbook. If your current tyres already match the manufacturer specification, you can use those sidewall markings as a guide when selecting replacements. Avoid fitting a lower rating, as it can affect safety, insurance, and MOT compliance.
The correct pressure depends on the vehicle, axle load, and whether you are carrying passengers or luggage, so use the manufacturer sticker (often in the door shut or fuel flap) as the primary reference. As a general guide, many small cars running this size sit somewhere in the high-20s to low-30s PSI range, but your car may differ. Check pressures when tyres are cold and adjust if your driving conditions change.
Those alternatives change the overall diameter and width, which can affect speedometer accuracy, gearing, ground clearance, and the risk of rubbing on arches or suspension. If you are considering a change, confirm it is an approved fitment for your exact model and wheel width, ideally using the vehicle handbook or a professional fitter. Sticking with the specified size is usually the simplest way to maintain the intended handling and ride.
Most modern 13-inch wheels are designed for tubeless tyres, so inner tubes are usually not required. Some older or specialist rims (for example, certain classic wheel designs) may need tubes, and using the wrong setup can cause slow leaks or chafing. Check whether your wheels are tubeless-rated, and if in doubt, ask your fitter to confirm before fitting.
