Tire Size Box

305/30R22 vs 305/35R22

305/35R22 compared with 305/30R22

+4.1% diameter, 0.0" width

305/35R22 is 30.41" tall vs 29.20". More than the 3% rule of thumb, so check carefully before switching.

29.2"22" rim3.6"12.0" wide
305/30R22 (solid) compared with 305/35R22 (dashed outline), drawn to scale

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

62.5 mph

305/35R22 is +1.20 inches (+4.1%) in overall diameter. That is more than the 3% most shops and makers recommend.

305/30R22305/35R22Difference%
Overall diameter29.20"30.41"+1.20"+4.1%
Section width12.01"12.01"0.00"0.0%
Sidewall height3.60"4.20"+0.60"+16.7%
Circumference91.75"95.52"+3.77"+4.1%
Revolutions per mile690.6663.3−27.3−3.9%

Speedometer difference

If your vehicle came with 305/30R22 and you fit 305/35R22, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph20.8 mph+0.8 mph
30 mph31.2 mph+1.2 mph
40 mph41.6 mph+1.6 mph
50 mph52.1 mph+2.1 mph
60 mph62.5 mph+2.5 mph
65 mph67.7 mph+2.7 mph
70 mph72.9 mph+2.9 mph
75 mph78.1 mph+3.1 mph
80 mph83.3 mph+3.3 mph

Each size on its own

Questions

Which is bigger, 305/30R22 or 305/35R22?
305/35R22 is taller by 1.20 inches (30.41" vs 29.20"). 305/30R22 is the same width.
Can I replace 305/30R22 with 305/35R22?
It is not recommended without checking carefully. The diameter difference is +4.1%, 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 305/35R22 change my speedometer?
When your speedometer reads 60 mph with 305/35R22 fitted (calibrated for 305/30R22), your real speed is 62.5 mph. Your odometer will under-count miles by about 4.1%.
Will 305/35R22 lift my vehicle?
Ride height changes by half the diameter difference: +0.60 inches of ground clearance at the axle.

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