Section Width855 mm (33.7")
Aspect Ratio36%
Rim Diameter18"
Overall Diameter1073 mm (42.2")
Sidewall Height308 mm
Circumference3370 mm
855/36R18 — Buy Tires

Everything to know about the 855/36R18 tire size

Size geometry

A 855/36R18 tire has a 855mm section width and a 36% aspect ratio, mounted on a 18-inch rim. Sidewall height works out to 307.8mm (12.12") and overall outside diameter is 1072.8mm (42.24"). At highway speed the tire completes about 297 revolutions per kilometre — your speedometer and odometer were calibrated against this number.

Direct substitute sizes

If 855/36R18 is unavailable, the closest same-diameter substitutes on the same rim are 845/36R18 and 865/36R18. 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 855/36R18 you can upsize to 865/34R19 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 845/38R17 (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 855/36R18 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 855/36R18

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