Tire Size Box

355/30R22 vs 345/35R22

345/35R22 compared with 355/30R22

+3.7% diameter, −0.4" width

345/35R22 is 31.51" tall vs 30.39". More than the 3% rule of thumb, so check carefully before switching.

30.4"22" rim4.2"14.0" wide
355/30R22 (solid) compared with 345/35R22 (dashed outline), drawn to scale

With 345/35R22 tires, when your speedometer says 60 mph you are really going

62.2 mph

345/35R22 is +1.12 inches (+3.7%) in overall diameter. That is more than the 3% most shops and makers recommend.

355/30R22345/35R22Difference%
Overall diameter30.39"31.51"+1.12"+3.7%
Section width13.98"13.58"−0.39"−2.8%
Sidewall height4.19"4.75"+0.56"+13.4%
Circumference95.46"98.98"+3.53"+3.7%
Revolutions per mile663.7640.1−23.6−3.6%

Speedometer difference

If your vehicle came with 355/30R22 and you fit 345/35R22, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.7 mph+0.7 mph
30 mph31.1 mph+1.1 mph
40 mph41.5 mph+1.5 mph
50 mph51.8 mph+1.8 mph
60 mph62.2 mph+2.2 mph
65 mph67.4 mph+2.4 mph
70 mph72.6 mph+2.6 mph
75 mph77.8 mph+2.8 mph
80 mph83.0 mph+3.0 mph

Each size on its own

Questions

Which is bigger, 355/30R22 or 345/35R22?
345/35R22 is taller by 1.12 inches (31.51" vs 30.39"). 355/30R22 is wider by 0.39 inches.
Can I replace 355/30R22 with 345/35R22?
It is not recommended without checking carefully. The diameter difference is +3.7%, 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 345/35R22 change my speedometer?
When your speedometer reads 60 mph with 345/35R22 fitted (calibrated for 355/30R22), your real speed is 62.2 mph. Your odometer will under-count miles by about 3.7%.
Will 345/35R22 lift my vehicle?
Ride height changes by half the diameter difference: +0.56 inches of ground clearance at the axle.

Other comparisons