Tire Size Box

345/25R24 vs 345/35R24

345/35R24 compared with 345/25R24

+8.8% diameter, 0.0" width

345/35R24 is 33.51" tall vs 30.79". More than the 3% rule of thumb, so check carefully before switching.

30.8"24" rim3.4"13.6" wide
345/25R24 (solid) compared with 345/35R24 (dashed outline), drawn to scale

With 345/35R24 tires, when your speedometer says 60 mph you are really going

65.3 mph

345/35R24 is +2.72 inches (+8.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

345/25R24345/35R24Difference%
Overall diameter30.79"33.51"+2.72"+8.8%
Section width13.58"13.58"0.00"0.0%
Sidewall height3.40"4.75"+1.36"+40.0%
Circumference96.73"105.27"+8.53"+8.8%
Revolutions per mile655.0601.9−53.1−8.1%

Speedometer difference

If your vehicle came with 345/25R24 and you fit 345/35R24, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.8 mph+1.8 mph
30 mph32.6 mph+2.6 mph
40 mph43.5 mph+3.5 mph
50 mph54.4 mph+4.4 mph
60 mph65.3 mph+5.3 mph
65 mph70.7 mph+5.7 mph
70 mph76.2 mph+6.2 mph
75 mph81.6 mph+6.6 mph
80 mph87.1 mph+7.1 mph

Each size on its own

Questions

Which is bigger, 345/25R24 or 345/35R24?
345/35R24 is taller by 2.72 inches (33.51" vs 30.79"). 345/25R24 is the same width.
Can I replace 345/25R24 with 345/35R24?
It is not recommended without checking carefully. The diameter difference is +8.8%, 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 345/35R24 change my speedometer?
When your speedometer reads 60 mph with 345/35R24 fitted (calibrated for 345/25R24), your real speed is 65.3 mph. Your odometer will under-count miles by about 8.8%.
Will 345/35R24 lift my vehicle?
Ride height changes by half the diameter difference: +1.36 inches of ground clearance at the axle.

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