975/40R12 Tire Size Specifications
This tire size 975/40R12 fits 0 vehicles in our database.
Everything to know about the 975/40R12 tire size
Size geometry
A 975/40R12 tire has a 975mm section width and a 40% aspect ratio, mounted on a 12-inch rim. Sidewall height works out to 390.0mm (15.35") and overall outside diameter is 1084.8mm (42.71"). At highway speed the tire completes about 293 revolutions per kilometre â your speedometer and odometer were calibrated against this number.
Direct substitute sizes
If 975/40R12 is unavailable, the closest same-diameter substitutes on the same rim are 965/40R12 and 985/40R12. 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 975/40R12 you can upsize to 985/38R13 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 965/42R11 (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 975/40R12 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 975/40R12
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