Section Width785 mm (30.9")
Aspect Ratio10%
Rim Diameter31"
Overall Diameter944 mm (37.2")
Sidewall Height79 mm
Circumference2967 mm
785/10R31 — Buy Tires

Everything to know about the 785/10R31 tire size

Size geometry

A 785/10R31 tire has a 785mm section width and a 10% aspect ratio, mounted on a 31-inch rim. Sidewall height works out to 78.5mm (3.09") and overall outside diameter is 944.4mm (37.18"). At highway speed the tire completes about 337 revolutions per kilometre — your speedometer and odometer were calibrated against this number.

Direct substitute sizes

If 785/10R31 is unavailable, the closest same-diameter substitutes on the same rim are 775/10R31 and 795/10R31. Both keep your speedometer reading within 1% — safe for daily use, ABS, and stability control. Always verify load and speed ratings before swapping.

Plus / minus sizing options

For a 785/10R31 you can upsize to 795/8R32 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 775/12R30 (minus-one) for a softer ride or winter setup. Both stay inside the Âą3% diameter tolerance that ABS and TPMS systems expect.

Vehicle compatibility

0 vehicles in our database run the 785/10R31 tire size from the factory. Aftermarket fitment depends on rim width, offset, and clearance — match these specs to your wheel before purchasing tires.

Vehicles Using 785/10R31

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