Section Width645 mm (25.4")
Aspect Ratio26%
Rim Diameter16"
Overall Diameter742 mm (29.2")
Sidewall Height168 mm
Circumference2330 mm
645/26R16 — Buy Tires

Everything to know about the 645/26R16 tire size

Size geometry

A 645/26R16 tire has a 645mm section width and a 26% aspect ratio, mounted on a 16-inch rim. Sidewall height works out to 167.7mm (6.60") and overall outside diameter is 741.8mm (29.20"). At highway speed the tire completes about 429 revolutions per kilometre — your speedometer and odometer were calibrated against this number.

Direct substitute sizes

If 645/26R16 is unavailable, the closest same-diameter substitutes on the same rim are 635/26R16 and 655/26R16. 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 645/26R16 you can upsize to 655/24R17 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 635/28R15 (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 645/26R16 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 645/26R16

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