Tire Size Box

265/25R24 vs 265/30R24

265/30R24 compared with 265/25R24

+3.6% diameter, 0.0" width

265/30R24 is 30.26" tall vs 29.22". More than the 3% rule of thumb, so check carefully before switching.

29.2"24" rim2.6"10.4" wide
265/25R24 (solid) compared with 265/30R24 (dashed outline), drawn to scale

With 265/30R24 tires, when your speedometer says 60 mph you are really going

62.1 mph

265/30R24 is +1.04 inches (+3.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

265/25R24265/30R24Difference%
Overall diameter29.22"30.26"+1.04"+3.6%
Section width10.43"10.43"0.00"0.0%
Sidewall height2.61"3.13"+0.52"+20.0%
Circumference91.79"95.06"+3.28"+3.6%
Revolutions per mile690.3666.5−23.8−3.4%

Speedometer difference

If your vehicle came with 265/25R24 and you fit 265/30R24, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.1 mph+1.1 mph
40 mph41.4 mph+1.4 mph
50 mph51.8 mph+1.8 mph
60 mph62.1 mph+2.1 mph
65 mph67.3 mph+2.3 mph
70 mph72.5 mph+2.5 mph
75 mph77.7 mph+2.7 mph
80 mph82.9 mph+2.9 mph

Each size on its own

Questions

Which is bigger, 265/25R24 or 265/30R24?
265/30R24 is taller by 1.04 inches (30.26" vs 29.22"). 265/25R24 is the same width.
Can I replace 265/25R24 with 265/30R24?
It is not recommended without checking carefully. The diameter difference is +3.6%, more than the 3% most shops and makers allow. It will throw off the speedometer and may affect ABS, stability control and clearance.
How much will 265/30R24 change my speedometer?
When your speedometer reads 60 mph with 265/30R24 fitted (calibrated for 265/25R24), your real speed is 62.1 mph. Your odometer will under-count miles by about 3.6%.
Will 265/30R24 lift my vehicle?
Ride height changes by half the diameter difference: +0.52 inches of ground clearance at the axle.

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