Tire Size Box

205/65R17 vs 205/75R17

205/75R17 compared with 205/65R17

+5.9% diameter, 0.0" width

205/75R17 is 29.11" tall vs 27.49". More than the 3% rule of thumb, so check carefully before switching.

27.5"17" rim5.2"8.1" wide
205/65R17 (solid) compared with 205/75R17 (dashed outline), drawn to scale

With 205/75R17 tires, when your speedometer says 60 mph you are really going

63.5 mph

205/75R17 is +1.61 inches (+5.9%) in overall diameter. That is more than the 3% most shops and makers recommend.

205/65R17205/75R17Difference%
Overall diameter27.49"29.11"+1.61"+5.9%
Section width8.07"8.07"0.00"0.0%
Sidewall height5.25"6.05"+0.81"+15.4%
Circumference86.37"91.44"+5.07"+5.9%
Revolutions per mile733.6692.9−40.7−5.5%

Speedometer difference

If your vehicle came with 205/65R17 and you fit 205/75R17, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.2 mph+1.2 mph
30 mph31.8 mph+1.8 mph
40 mph42.3 mph+2.3 mph
50 mph52.9 mph+2.9 mph
60 mph63.5 mph+3.5 mph
65 mph68.8 mph+3.8 mph
70 mph74.1 mph+4.1 mph
75 mph79.4 mph+4.4 mph
80 mph84.7 mph+4.7 mph

Each size on its own

Questions

Which is bigger, 205/65R17 or 205/75R17?
205/75R17 is taller by 1.61 inches (29.11" vs 27.49"). 205/65R17 is the same width.
Can I replace 205/65R17 with 205/75R17?
It is not recommended without checking carefully. The diameter difference is +5.9%, 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 205/75R17 change my speedometer?
When your speedometer reads 60 mph with 205/75R17 fitted (calibrated for 205/65R17), your real speed is 63.5 mph. Your odometer will under-count miles by about 5.9%.
Will 205/75R17 lift my vehicle?
Ride height changes by half the diameter difference: +0.81 inches of ground clearance at the axle.

Other comparisons