Tire Size Box

275/60R15 vs 275/65R15

275/65R15 compared with 275/60R15

+3.9% diameter, 0.0" width

275/65R15 is 29.07" tall vs 27.99". More than the 3% rule of thumb, so check carefully before switching.

28.0"15" rim6.5"10.8" wide
275/60R15 (solid) compared with 275/65R15 (dashed outline), drawn to scale

With 275/65R15 tires, when your speedometer says 60 mph you are really going

62.3 mph

275/65R15 is +1.08 inches (+3.9%) in overall diameter. That is more than the 3% most shops and makers recommend.

275/60R15275/65R15Difference%
Overall diameter27.99"29.07"+1.08"+3.9%
Section width10.83"10.83"0.00"0.0%
Sidewall height6.50"7.04"+0.54"+8.3%
Circumference87.94"91.34"+3.40"+3.9%
Revolutions per mile720.5693.7−26.8−3.7%

Speedometer difference

If your vehicle came with 275/60R15 and you fit 275/65R15, 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 mph41.5 mph+1.5 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, 275/60R15 or 275/65R15?
275/65R15 is taller by 1.08 inches (29.07" vs 27.99"). 275/60R15 is the same width.
Can I replace 275/60R15 with 275/65R15?
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 275/65R15 change my speedometer?
When your speedometer reads 60 mph with 275/65R15 fitted (calibrated for 275/60R15), your real speed is 62.3 mph. Your odometer will under-count miles by about 3.9%.
Will 275/65R15 lift my vehicle?
Ride height changes by half the diameter difference: +0.54 inches of ground clearance at the axle.

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