Check the size printed on your current tyre sidewall and the vehicle placard (usually in the driver door shut or fuel flap). If they list 255/70 R18, stick with it to maintain the intended diameter and clearance. If you are considering changing size, confirm compatibility first because overall diameter changes can affect speedometer accuracy and suspension or arch clearance.
Use the load index and speed rating shown on the placard or in your handbook, then choose tyres that meet or exceed that specification. This matters even more on heavier 4x4s and pick-ups, especially if you tow or carry payloads regularly. If you see XL or reinforced versions, only choose them when they match your required specification or when you need the same rated capacity with a stronger construction.
For mostly motorway and town driving, road-focused patterns tend to be quieter and more efficient. If you drive on tracks, gravel or muddy access roads, an all-terrain design in 255/70 R18 can add bite and tougher sidewalls, but it may increase noise. For frequent cold-weather driving, look for winter tyres or all-season options with the 3PMSF symbol to improve traction in snow and slush.
It is best to fit the same pattern and similar wear levels across an axle to keep handling and braking predictable. On many 4x4 systems, running mismatched tyres can also create rolling circumference differences that may put extra strain on the drivetrain. If you need to replace just one tyre, match the model and specification as closely as possible, or replace in pairs to keep things even.
Cost varies with brand, tread type and specification, with all-terrain and winter-capable options often priced higher than road tyres due to construction and compound differences. Higher load ratings and certain speed ratings can also increase price, as can premium ranges designed for heavier vehicles. Compare like-for-like by filtering for the exact load index, speed rating and seasonal type you need, then choose the best balance for your driving and budget.
