225/50R18 Tire Size Specifications
This tire size 225/50R18 fits 9 vehicles in our database.
Everything to know about the 225/50R18 tire size
Size geometry
A 225/50R18 tire has a 225mm section width and a 50% aspect ratio, mounted on a 18-inch rim. Sidewall height works out to 112.5mm (4.43") and overall outside diameter is 682.2mm (26.86"). At highway speed the tire completes about 467 revolutions per kilometre â your speedometer and odometer were calibrated against this number.
Direct substitute sizes
If 225/50R18 is unavailable, the closest same-diameter substitutes on the same rim are 215/52R18 and 235/48R18. Both keep your speedometer reading within 1% â safe for daily use, ABS, and stability control. Always verify load and speed ratings before swapping.
Plus / minus sizing options
For a 225/50R18 you can upsize to 235/42R19 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 215/58R17 (minus-one) for a softer ride or winter setup. Both stay inside the Âą3% diameter tolerance that ABS and TPMS systems expect.
Vehicle compatibility
9 vehicles in our database run the 225/50R18 tire size from the factory. Aftermarket fitment depends on rim width, offset, and clearance â match these specs to your wheel before purchasing tires.