Tire Size Box

295/55R17 vs 295/65R17

295/65R17 compared with 295/55R17

+7.8% diameter, 0.0" width

295/65R17 is 32.10" tall vs 29.78". More than the 3% rule of thumb, so check carefully before switching.

29.8"17" rim6.4"11.6" wide
295/55R17 (solid) compared with 295/65R17 (dashed outline), drawn to scale

With 295/65R17 tires, when your speedometer says 60 mph you are really going

64.7 mph

295/65R17 is +2.32 inches (+7.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

295/55R17295/65R17Difference%
Overall diameter29.78"32.10"+2.32"+7.8%
Section width11.61"11.61"0.00"0.0%
Sidewall height6.39"7.55"+1.16"+18.2%
Circumference93.54"100.84"+7.30"+7.8%
Revolutions per mile677.3628.3−49.0−7.2%

Speedometer difference

If your vehicle came with 295/55R17 and you fit 295/65R17, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.6 mph+1.6 mph
30 mph32.3 mph+2.3 mph
40 mph43.1 mph+3.1 mph
50 mph53.9 mph+3.9 mph
60 mph64.7 mph+4.7 mph
65 mph70.1 mph+5.1 mph
70 mph75.5 mph+5.5 mph
75 mph80.9 mph+5.9 mph
80 mph86.2 mph+6.2 mph

Each size on its own

Questions

Which is bigger, 295/55R17 or 295/65R17?
295/65R17 is taller by 2.32 inches (32.10" vs 29.78"). 295/55R17 is the same width.
Can I replace 295/55R17 with 295/65R17?
It is not recommended without checking carefully. The diameter difference is +7.8%, 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 295/65R17 change my speedometer?
When your speedometer reads 60 mph with 295/65R17 fitted (calibrated for 295/55R17), your real speed is 64.7 mph. Your odometer will under-count miles by about 7.8%.
Will 295/65R17 lift my vehicle?
Ride height changes by half the diameter difference: +1.16 inches of ground clearance at the axle.

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