Tire Size Box

305/25R22 vs 305/35R22

305/35R22 compared with 305/25R22

+8.6% diameter, 0.0" width

305/35R22 is 30.41" tall vs 28.00". More than the 3% rule of thumb, so check carefully before switching.

28.0"22" rim3.0"12.0" wide
305/25R22 (solid) compared with 305/35R22 (dashed outline), drawn to scale

With 305/35R22 tires, when your speedometer says 60 mph you are really going

65.1 mph

305/35R22 is +2.40 inches (+8.6%) in overall diameter. That is more than the 3% most shops and makers recommend.

305/25R22305/35R22Difference%
Overall diameter28.00"30.41"+2.40"+8.6%
Section width12.01"12.01"0.00"0.0%
Sidewall height3.00"4.20"+1.20"+40.0%
Circumference87.98"95.52"+7.54"+8.6%
Revolutions per mile720.2663.3−56.9−7.9%

Speedometer difference

If your vehicle came with 305/25R22 and you fit 305/35R22, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.7 mph+1.7 mph
30 mph32.6 mph+2.6 mph
40 mph43.4 mph+3.4 mph
50 mph54.3 mph+4.3 mph
60 mph65.1 mph+5.1 mph
65 mph70.6 mph+5.6 mph
70 mph76.0 mph+6.0 mph
75 mph81.4 mph+6.4 mph
80 mph86.9 mph+6.9 mph

Each size on its own

Questions

Which is bigger, 305/25R22 or 305/35R22?
305/35R22 is taller by 2.40 inches (30.41" vs 28.00"). 305/25R22 is the same width.
Can I replace 305/25R22 with 305/35R22?
It is not recommended without checking carefully. The diameter difference is +8.6%, 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 305/35R22 change my speedometer?
When your speedometer reads 60 mph with 305/35R22 fitted (calibrated for 305/25R22), your real speed is 65.1 mph. Your odometer will under-count miles by about 8.6%.
Will 305/35R22 lift my vehicle?
Ride height changes by half the diameter difference: +1.20 inches of ground clearance at the axle.

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