Tire Size Box

245/60R17 vs 245/65R17

245/65R17 compared with 245/60R17

+3.4% diameter, 0.0" width

245/65R17 is 29.54" tall vs 28.57". More than the 3% rule of thumb, so check carefully before switching.

28.6"17" rim5.8"9.6" wide
245/60R17 (solid) compared with 245/65R17 (dashed outline), drawn to scale

With 245/65R17 tires, when your speedometer says 60 mph you are really going

62.0 mph

245/65R17 is +0.96 inches (+3.4%) in overall diameter. That is more than the 3% most shops and makers recommend.

245/60R17245/65R17Difference%
Overall diameter28.57"29.54"+0.96"+3.4%
Section width9.65"9.65"0.00"0.0%
Sidewall height5.79"6.27"+0.48"+8.3%
Circumference89.77"92.80"+3.03"+3.4%
Revolutions per mile705.8682.8−23.0−3.3%

Speedometer difference

If your vehicle came with 245/60R17 and you fit 245/65R17, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.0 mph+1.0 mph
40 mph41.4 mph+1.4 mph
50 mph51.7 mph+1.7 mph
60 mph62.0 mph+2.0 mph
65 mph67.2 mph+2.2 mph
70 mph72.4 mph+2.4 mph
75 mph77.5 mph+2.5 mph
80 mph82.7 mph+2.7 mph

Each size on its own

Questions

Which is bigger, 245/60R17 or 245/65R17?
245/65R17 is taller by 0.96 inches (29.54" vs 28.57"). 245/60R17 is the same width.
Can I replace 245/60R17 with 245/65R17?
It is not recommended without checking carefully. The diameter difference is +3.4%, 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 245/65R17 change my speedometer?
When your speedometer reads 60 mph with 245/65R17 fitted (calibrated for 245/60R17), your real speed is 62.0 mph. Your odometer will under-count miles by about 3.4%.
Will 245/65R17 lift my vehicle?
Ride height changes by half the diameter difference: +0.48 inches of ground clearance at the axle.

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