135 is the tyre width in millimetres, 80 is the aspect ratio (sidewall height as a percentage of width), R means radial construction, and 13 is the wheel rim diameter in inches. For a like-for-like replacement, the size should match exactly, along with the correct load index and speed rating.
Only switch if your vehicle manufacturer lists 135/80 R13 as an approved alternative size. 145/80 R13 is wider and has a larger overall diameter, which can affect speedometer accuracy, ground clearance and wheel-arch clearance. If it is not an approved size for your model, stick with the original specification.
Use the tyre placard in the door shut or the handbook to find the required load index and speed rating for your car. When buying 135/80 R13, you can choose a higher rating, but you should not go lower than the manufacturer requirement. If it is for a trailer, match the tyre load rating to the axle capacity and your typical laden weight.
Yes, but the range can be more limited than common modern sizes, so it is worth checking availability early. If you drive year-round in mixed UK conditions, an all-season 135/80 R13 can be a practical choice, while a winter tyre is better suited to regular cold-weather and snow use. Compare the tread type and EU label ratings alongside price to pick the right option.
Check the sidewall markings and the wheel itself. Temporary spares are often labelled as space-saver or have a prominent temporary-use marking, and they usually have strict speed and distance limits. If you need a normal road tyre, choose a standard 135/80 R13 with the correct load and speed rating rather than a temporary spare tyre.
