245 is the tyre width in millimetres, 70 is the sidewall height as a percentage of the width (around 172 mm), R means radial construction, and 17 is the wheel diameter in inches. This combination creates an overall diameter of roughly 775 mm, which is why it is commonly used on 4x4s and pick-ups that need extra sidewall height.
Match the load index and speed rating shown on your current tyres or the vehicle placard, and do not go below the manufacturer requirement. This size is frequently fitted to heavier vehicles, so higher load ratings are common (often in the 112-116 range), especially for towing or carrying payloads. If you are unsure, choose the exact rating currently fitted and then select your preferred brand and tread pattern.
Only if the new overall diameter and width are compatible with your vehicle, wheels, and wheel arches. 245/70 R17 is relatively tall, so changing from a lower-profile 17-inch option can affect speedometer reading, gearing feel, and clearance on full lock or under suspension compression. Check the handbook, compare the rolling circumference, and confirm with a tyre professional before ordering.
Yes, if you want a tyre that can handle mixed use such as road miles plus farm tracks, lanes, or light off-road work. All-terrain patterns in this size usually have chunkier tread blocks and reinforced construction, which can improve durability on rough surfaces, but may add a little road noise and reduce fuel efficiency compared with a pure road tyre. Choose an all-terrain option if you genuinely need the extra bite and protection.
Use the vehicle manufacturer recommendation on the door jamb sticker, fuel flap label, or owner’s handbook, as pressures vary by vehicle, axle load, and tyre specification. The correct value can change when towing, carrying heavy loads, or driving at sustained motorway speeds, so follow the listed “loaded” setting when applicable. Avoid using the maximum pressure printed on the tyre sidewall as a default.
