Home › 22" tire sizes › 305/40R22
305/40R22 tire size in inches
305/40R22 is 31.61" tall and 12.01" wide, and fits a 22" rim. In flotation (inch) sizing that is roughly 31.6x12.0R22.
305/40R22 dimensions
| Measurement | Inches | Metric |
|---|---|---|
| Overall diameter (height) | 31.61" | 803 mm |
| Section width | 12.01" | 305 mm |
| Sidewall height | 4.80" | 122.0 mm |
| Rim diameter | 22" | 558.8 mm |
| Circumference | 99.3" | 2522 mm |
| Revolutions per mile | 638 | |
| Aspect ratio | 40% (sidewall is 40% of the width) | |
Drawn to scale
Among the 65 sizes for 22" wheels on this site, 305/40R22 is #25 by height (shortest: 235/30R22, tallest: 285/75R22).
What people compare 305/40R22 with
Real comparisons drivers search for, worked out against 305/40R22:
| Compared size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 285/45R22 | +0.49" (+1.55%) | -0.79" | +0.25" | 59.1 mph |
| 305/45R22 | +1.20" (+3.8%) | 0.00" | +0.60" | 57.8 mph |
305/40R22 against the most popular 22" sizes
| Popular size | Height | Width | Sidewall | Speedo at true 60 |
|---|---|---|---|---|
| 285/55R22 | +2.73" (+8.64%) | -0.79" | +1.37" | 55.2 mph |
| 325/50R22 | +3.19" (+10.09%) | +0.79" | +1.60" | 54.5 mph |
| 275/50R22 | +1.22" (+3.86%) | -1.18" | +0.61" | 57.8 mph |
| 285/50R22 | +1.61" (+5.09%) | -0.79" | +0.81" | 57.1 mph |
| 295/55R22 | +3.17" (+10.03%) | -0.40" | +1.59" | 54.5 mph |
How the 305/40R22 numbers are worked out
The size code reads as 305 mm section width, 40% aspect ratio, R for radial construction and 22-inch wheel.
- Sidewall = 305 × 40% = 122.0 mm = 4.80"
- Diameter = 22" + 2 × 4.80" = 31.61"
- Circumference = π × 31.61" = 99.3"
- Revs per mile = 63,360" ÷ 99.3" = 638
Sizes that can replace 305/40R22 on a 22" wheel
Within 3% of 31.61". Last column: speedometer reading at a true 60 mph.
| Size | Diameter | Width | Difference | Speedo at true 60 mph |
|---|---|---|---|---|
| 275/45R22 | 31.74" | 10.83" | +0.41% | 59.8 mph |
| 265/45R22 | 31.39" | 10.43" | -0.7% | 60.4 mph |
| 315/40R22 | 31.92" | 12.40" | +0.98% | 59.4 mph |
| 295/40R22 | 31.29" | 11.61" | -1.01% | 60.6 mph |
| 285/45R22 | 32.10" | 11.22" | +1.55% | 59.1 mph |
| 285/40R22 | 30.98" | 11.22" | -1.99% | 61.2 mph |
| 325/40R22 | 32.24" | 12.80" | +1.99% | 58.8 mph |
| 325/35R22 | 30.96" | 12.80" | -2.06% | 61.3 mph |
| 265/50R22 | 32.43" | 10.43" | +2.59% | 58.5 mph |
| 295/45R22 | 32.45" | 11.61" | +2.66% | 58.4 mph |
| 315/35R22 | 30.68" | 12.40" | -2.94% | 61.8 mph |
| 245/45R22 | 30.68" | 9.65" | -2.94% | 61.8 mph |
One size wider or narrower
- Narrower: 295/40R22 — 11.61" wide, 31.29" tall
- Wider: 315/40R22 — 12.40" wide, 31.92" tall
Same height on a different wheel size
- 265/80R15 15" (+0.25%)
- 305/70R15 15" (+0.63%)
- 245/85R15 15" (-0.66%)
- 285/75R15 15" (+0.7%)
- 295/70R15 15" (-1.11%)
- 275/75R15 15" (-1.17%)
- 255/85R15 15" (+1.46%)
- 255/80R15 15" (-1.74%)
- 305/65R16 16" (0%)
- 265/75R16 16" (+0.13%)
Questions about 305/40R22
How tall is a 305/40R22 tire in inches?
A 305/40R22 tire is 31.61 inches (803 mm) tall: the 22-inch rim plus two sidewalls of 4.80 inches each.
Is 305/40R22 a 32 inch tire?
Yes. At 31.61 inches tall it is commonly called a 32-inch tire.
How many revolutions per mile does a 305/40R22 make?
About 638 revolutions per mile, based on a calculated circumference of 99.3 inches.
What size can replace 305/40R22?
275/45R22 is the closest match on a 22" rim (+0.41% height). Check load index, speed rating and clearance first.
Compare 305/40R22 against any other size with the tire size calculator.