115/378R40 Tire Size Specifications
This tire size 115/378R40 fits 0 vehicles in our database.
Everything to know about the 115/378R40 tire size
Size geometry
A 115/378R40 tire has a 115mm section width and a 378% aspect ratio, mounted on a 40-inch rim. Sidewall height works out to 434.7mm (17.11") and overall outside diameter is 1885.4mm (74.23"). At highway speed the tire completes about 169 revolutions per kilometre â your speedometer and odometer were calibrated against this number.
Direct substitute sizes
If 115/378R40 is unavailable, the closest same-diameter substitutes on the same rim are 105/414R40 and 125/348R40. 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 115/378R40 you can upsize to 125/338R41 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 105/426R39 (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 115/378R40 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 115/378R40
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