Section Width125 mm (4.9")
Aspect Ratio324%
Rim Diameter42"
Overall Diameter1877 mm (73.9")
Sidewall Height405 mm
Circumference5896 mm
125/324R42 — Buy Tires

Everything to know about the 125/324R42 tire size

Size geometry

A 125/324R42 tire has a 125mm section width and a 324% aspect ratio, mounted on a 42-inch rim. Sidewall height works out to 405.0mm (15.94") and overall outside diameter is 1876.8mm (73.89"). At highway speed the tire completes about 170 revolutions per kilometre — your speedometer and odometer were calibrated against this number.

Direct substitute sizes

If 125/324R42 is unavailable, the closest same-diameter substitutes on the same rim are 115/352R42 and 135/300R42. 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 125/324R42 you can upsize to 135/291R43 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 115/363R41 (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 125/324R42 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 125/324R42

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