Tire Size Box

225/70R16 vs 245/70R16

245/70R16 compared with 225/70R16

+3.9% diameter, +0.8" width

245/70R16 is 29.50" tall vs 28.40". More than the 3% rule of thumb, so check carefully before switching.

28.4"16" rim6.2"8.9" wide
225/70R16 (solid) compared with 245/70R16 (dashed outline), drawn to scale

With 245/70R16 tires, when your speedometer says 60 mph you are really going

62.3 mph

245/70R16 is +1.10 inches (+3.9%) in overall diameter. That is more than the 3% most shops and makers recommend.

225/70R16245/70R16Difference%
Overall diameter28.40"29.50"+1.10"+3.9%
Section width8.86"9.65"+0.79"+8.9%
Sidewall height6.20"6.75"+0.55"+8.9%
Circumference89.23"92.69"+3.46"+3.9%
Revolutions per mile710.1683.6−26.5−3.7%

Speedometer difference

If your vehicle came with 225/70R16 and you fit 245/70R16, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.2 mph+1.2 mph
40 mph41.6 mph+1.6 mph
50 mph51.9 mph+1.9 mph
60 mph62.3 mph+2.3 mph
65 mph67.5 mph+2.5 mph
70 mph72.7 mph+2.7 mph
75 mph77.9 mph+2.9 mph
80 mph83.1 mph+3.1 mph

Each size on its own

Questions

Which is bigger, 225/70R16 or 245/70R16?
245/70R16 is taller by 1.10 inches (29.50" vs 28.40"). 245/70R16 is wider by 0.79 inches.
Can I replace 225/70R16 with 245/70R16?
It is not recommended without checking carefully. The diameter difference is +3.9%, 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 245/70R16 change my speedometer?
When your speedometer reads 60 mph with 245/70R16 fitted (calibrated for 225/70R16), your real speed is 62.3 mph. Your odometer will under-count miles by about 3.9%.
Will 245/70R16 lift my vehicle?
Ride height changes by half the diameter difference: +0.55 inches of ground clearance at the axle.

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