Section Width145 mm (5.7")
Aspect Ratio420%
Rim Diameter26"
Overall Diameter1878 mm (74.0")
Sidewall Height609 mm
Circumference5901 mm
145/420R26 — Buy Tires

Everything to know about the 145/420R26 tire size

Size geometry

A 145/420R26 tire has a 145mm section width and a 420% aspect ratio, mounted on a 26-inch rim. Sidewall height works out to 609.0mm (23.98") and overall outside diameter is 1878.4mm (73.95"). At highway speed the tire completes about 169 revolutions per kilometre — your speedometer and odometer were calibrated against this number.

Direct substitute sizes

If 145/420R26 is unavailable, the closest same-diameter substitutes on the same rim are 135/451R26 and 155/393R26. 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 145/420R26 you can upsize to 155/385R27 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 135/461R25 (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 145/420R26 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 145/420R26

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