Section Width175 mm (6.9")
Aspect Ratio368%
Rim Diameter20"
Overall Diameter1796 mm (70.7")
Sidewall Height644 mm
Circumference5642 mm
175/368R20 — Buy Tires

Everything to know about the 175/368R20 tire size

Size geometry

A 175/368R20 tire has a 175mm section width and a 368% aspect ratio, mounted on a 20-inch rim. Sidewall height works out to 644.0mm (25.35") and overall outside diameter is 1796.0mm (70.71"). At highway speed the tire completes about 177 revolutions per kilometre — your speedometer and odometer were calibrated against this number.

Direct substitute sizes

If 175/368R20 is unavailable, the closest same-diameter substitutes on the same rim are 165/390R20 and 185/348R20. 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 175/368R20 you can upsize to 185/341R21 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 165/398R19 (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 175/368R20 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 175/368R20

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