Section Width115 mm (4.5")
Aspect Ratio568%
Rim Diameter21"
Overall Diameter1840 mm (72.4")
Sidewall Height653 mm
Circumference5780 mm
115/568R21 — Buy Tires

Everything to know about the 115/568R21 tire size

Size geometry

A 115/568R21 tire has a 115mm section width and a 568% aspect ratio, mounted on a 21-inch rim. Sidewall height works out to 653.2mm (25.72") and overall outside diameter is 1839.8mm (72.43"). At highway speed the tire completes about 173 revolutions per kilometre — your speedometer and odometer were calibrated against this number.

Direct substitute sizes

If 115/568R21 is unavailable, the closest same-diameter substitutes on the same rim are 105/622R21 and 125/523R21. 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 115/568R21 you can upsize to 125/512R22 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 105/634R20 (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 115/568R21 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 115/568R21

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