Tire Size Box

205/30R19 vs 215/25R20

215/25R20 compared with 205/30R19

+1.6% diameter, +0.4" width

215/25R20 is 24.23" tall vs 23.84". Within the 3% rule, so usually interchangeable.

23.8"19" rim2.4"8.1" wide
205/30R19 (solid) compared with 215/25R20 (dashed outline), drawn to scale

With 215/25R20 tires, when your speedometer says 60 mph you are really going

61.0 mph

215/25R20 is +0.39 inches (+1.6%) in overall diameter. That is within the 3% most shops and makers allow.

205/30R19215/25R20Difference%
Overall diameter23.84"24.23"+0.39"+1.6%
Section width8.07"8.46"+0.39"+4.9%
Sidewall height2.42"2.12"−0.31"−12.6%
Circumference74.90"76.13"+1.22"+1.6%
Revolutions per mile845.9832.3−13.6−1.6%

Speedometer difference

If your vehicle came with 205/30R19 and you fit 215/25R20, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.3 mph+0.3 mph
30 mph30.5 mph+0.5 mph
40 mph40.7 mph+0.7 mph
50 mph50.8 mph+0.8 mph
60 mph61.0 mph+1.0 mph
65 mph66.1 mph+1.1 mph
70 mph71.1 mph+1.1 mph
75 mph76.2 mph+1.2 mph
80 mph81.3 mph+1.3 mph

Each size on its own

Questions

Which is bigger, 205/30R19 or 215/25R20?
215/25R20 is taller by 0.39 inches (24.23" vs 23.84"). 215/25R20 is wider by 0.39 inches.
Can I replace 205/30R19 with 215/25R20?
Usually, yes. The diameter difference is +1.6%, inside the 3% rule of thumb most tire shops use. Check that the wider or taller tire clears your suspension and fenders, and that its load index meets your placard.
How much will 215/25R20 change my speedometer?
When your speedometer reads 60 mph with 215/25R20 fitted (calibrated for 205/30R19), your real speed is 61.0 mph. Your odometer will under-count miles by about 1.6%.
Will 215/25R20 lift my vehicle?
Ride height changes by half the diameter difference: +0.19 inches of ground clearance at the axle.

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