Section Width525 mm (20.7")
Aspect Ratio35%
Rim Diameter18"
Overall Diameter825 mm (32.5")
Sidewall Height184 mm
Circumference2591 mm
525/35R18 — Buy Tires

Everything to know about the 525/35R18 tire size

Size geometry

A 525/35R18 tire has a 525mm section width and a 35% aspect ratio, mounted on a 18-inch rim. Sidewall height works out to 183.8mm (7.23") and overall outside diameter is 824.7mm (32.47"). At highway speed the tire completes about 386 revolutions per kilometre — your speedometer and odometer were calibrated against this number.

Direct substitute sizes

If 525/35R18 is unavailable, the closest same-diameter substitutes on the same rim are 515/36R18 and 535/34R18. 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 525/35R18 you can upsize to 535/32R19 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 515/38R17 (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 525/35R18 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 525/35R18

tire_size.no_vehicles_found