815/25R20 Tire Size Specifications
This tire size 815/25R20 fits 0 vehicles in our database.
Everything to know about the 815/25R20 tire size
Size geometry
A 815/25R20 tire has a 815mm section width and a 25% aspect ratio, mounted on a 20-inch rim. Sidewall height works out to 203.8mm (8.02") and overall outside diameter is 915.5mm (36.04"). At highway speed the tire completes about 348 revolutions per kilometre â your speedometer and odometer were calibrated against this number.
Direct substitute sizes
If 815/25R20 is unavailable, the closest same-diameter substitutes on the same rim are 805/25R20 and 825/25R20. 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 815/25R20 you can upsize to 825/23R21 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 805/27R19 (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 815/25R20 tire size from the factory. Aftermarket fitment depends on rim width, offset, and clearance â match these specs to your wheel before purchasing tires.
Vehicles Using 815/25R20
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