Section Width765 mm (30.1")
Aspect Ratio18%
Rim Diameter30"
Overall Diameter1037 mm (40.8")
Sidewall Height138 mm
Circumference3259 mm
765/18R30 — Buy Tires

Everything to know about the 765/18R30 tire size

Size geometry

A 765/18R30 tire has a 765mm section width and a 18% aspect ratio, mounted on a 30-inch rim. Sidewall height works out to 137.7mm (5.42") and overall outside diameter is 1037.4mm (40.84"). At highway speed the tire completes about 307 revolutions per kilometre — your speedometer and odometer were calibrated against this number.

Direct substitute sizes

If 765/18R30 is unavailable, the closest same-diameter substitutes on the same rim are 755/18R30 and 775/18R30. 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 765/18R30 you can upsize to 775/16R31 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 755/20R29 (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 765/18R30 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 765/18R30

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