Tire Size Box

315/25R22 vs 315/35R22

315/35R22 compared with 315/25R22

+8.8% diameter, 0.0" width

315/35R22 is 30.68" tall vs 28.20". More than the 3% rule of thumb, so check carefully before switching.

28.2"22" rim3.1"12.4" wide
315/25R22 (solid) compared with 315/35R22 (dashed outline), drawn to scale

With 315/35R22 tires, when your speedometer says 60 mph you are really going

65.3 mph

315/35R22 is +2.48 inches (+8.8%) in overall diameter. That is more than the 3% most shops and makers recommend.

315/25R22315/35R22Difference%
Overall diameter28.20"30.68"+2.48"+8.8%
Section width12.40"12.40"0.00"0.0%
Sidewall height3.10"4.34"+1.24"+40.0%
Circumference88.60"96.39"+7.79"+8.8%
Revolutions per mile715.2657.3−57.8−8.1%

Speedometer difference

If your vehicle came with 315/25R22 and you fit 315/35R22, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.8 mph+1.8 mph
30 mph32.6 mph+2.6 mph
40 mph43.5 mph+3.5 mph
50 mph54.4 mph+4.4 mph
60 mph65.3 mph+5.3 mph
65 mph70.7 mph+5.7 mph
70 mph76.2 mph+6.2 mph
75 mph81.6 mph+6.6 mph
80 mph87.0 mph+7.0 mph

Each size on its own

Questions

Which is bigger, 315/25R22 or 315/35R22?
315/35R22 is taller by 2.48 inches (30.68" vs 28.20"). 315/25R22 is the same width.
Can I replace 315/25R22 with 315/35R22?
It is not recommended without checking carefully. The diameter difference is +8.8%, 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 315/35R22 change my speedometer?
When your speedometer reads 60 mph with 315/35R22 fitted (calibrated for 315/25R22), your real speed is 65.3 mph. Your odometer will under-count miles by about 8.8%.
Will 315/35R22 lift my vehicle?
Ride height changes by half the diameter difference: +1.24 inches of ground clearance at the axle.

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