Tire Size Box

215/50R17 vs 235/50R17

235/50R17 compared with 215/50R17

+3.1% diameter, +0.8" width

235/50R17 is 26.25" tall vs 25.46". More than the 3% rule of thumb, so check carefully before switching.

25.5"17" rim4.2"8.5" wide
215/50R17 (solid) compared with 235/50R17 (dashed outline), drawn to scale

With 235/50R17 tires, when your speedometer says 60 mph you are really going

61.9 mph

235/50R17 is +0.79 inches (+3.1%) in overall diameter. That is more than the 3% most shops and makers recommend.

215/50R17235/50R17Difference%
Overall diameter25.46"26.25"+0.79"+3.1%
Section width8.46"9.25"+0.79"+9.3%
Sidewall height4.23"4.63"+0.39"+9.3%
Circumference80.00"82.47"+2.47"+3.1%
Revolutions per mile792.0768.3−23.8−3.0%

Speedometer difference

If your vehicle came with 215/50R17 and you fit 235/50R17, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.6 mph+0.6 mph
30 mph30.9 mph+0.9 mph
40 mph41.2 mph+1.2 mph
50 mph51.5 mph+1.5 mph
60 mph61.9 mph+1.9 mph
65 mph67.0 mph+2.0 mph
70 mph72.2 mph+2.2 mph
75 mph77.3 mph+2.3 mph
80 mph82.5 mph+2.5 mph

Each size on its own

Questions

Which is bigger, 215/50R17 or 235/50R17?
235/50R17 is taller by 0.79 inches (26.25" vs 25.46"). 235/50R17 is wider by 0.79 inches.
Can I replace 215/50R17 with 235/50R17?
It is not recommended without checking carefully. The diameter difference is +3.1%, 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 235/50R17 change my speedometer?
When your speedometer reads 60 mph with 235/50R17 fitted (calibrated for 215/50R17), your real speed is 61.9 mph. Your odometer will under-count miles by about 3.1%.
Will 235/50R17 lift my vehicle?
Ride height changes by half the diameter difference: +0.39 inches of ground clearance at the axle.

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