Tire Size Box

215/75R17 vs 235/75R17

235/75R17 compared with 215/75R17

+4.0% diameter, +0.8" width

235/75R17 is 30.88" tall vs 29.70". More than the 3% rule of thumb, so check carefully before switching.

29.7"17" rim6.3"8.5" wide
215/75R17 (solid) compared with 235/75R17 (dashed outline), drawn to scale

With 235/75R17 tires, when your speedometer says 60 mph you are really going

62.4 mph

235/75R17 is +1.18 inches (+4.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

215/75R17235/75R17Difference%
Overall diameter29.70"30.88"+1.18"+4.0%
Section width8.46"9.25"+0.79"+9.3%
Sidewall height6.35"6.94"+0.59"+9.3%
Circumference93.30"97.01"+3.71"+4.0%
Revolutions per mile679.1653.2−26.0−3.8%

Speedometer difference

If your vehicle came with 215/75R17 and you fit 235/75R17, 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 mph52.0 mph+2.0 mph
60 mph62.4 mph+2.4 mph
65 mph67.6 mph+2.6 mph
70 mph72.8 mph+2.8 mph
75 mph78.0 mph+3.0 mph
80 mph83.2 mph+3.2 mph

Each size on its own

Questions

Which is bigger, 215/75R17 or 235/75R17?
235/75R17 is taller by 1.18 inches (30.88" vs 29.70"). 235/75R17 is wider by 0.79 inches.
Can I replace 215/75R17 with 235/75R17?
It is not recommended without checking carefully. The diameter difference is +4.0%, 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 235/75R17 change my speedometer?
When your speedometer reads 60 mph with 235/75R17 fitted (calibrated for 215/75R17), your real speed is 62.4 mph. Your odometer will under-count miles by about 4.0%.
Will 235/75R17 lift my vehicle?
Ride height changes by half the diameter difference: +0.59 inches of ground clearance at the axle.

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