225/85R16 tire size
225/85R16 is a metric size: 31.1" tall, 8.9" wide, on a 16" rim — about a 31x9.00R16. The sidewall is 7.5" and the tire turns 649 times per mile.
225/85R16 specs
| Overall diameter (height) | 31.06" · 789 mm |
|---|---|
| Section width | 8.86" · 225 mm |
| Sidewall height | 7.53" · 191 mm (85% of width) |
| Rim diameter | 16" |
| Circumference | 97.57" · 2.478 m |
| Revolutions per mile | 649 (403 per km) |
| Inch (flotation) equivalent | 31x9.00R16 |
Equivalent sizes on a 16" rim
Sizes within ±5% of the overall diameter. Green rows are inside the usual ±3% limit for keeping the speedometer, ABS and gearing right; red rows are bigger changes that need clearance checks.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 265/75R16 common | 31.65" | +1.90% | +40 mm | 61.1 mph | calculate → |
| 245/75R16 common | 30.47" | -1.90% | +20 mm | 58.9 mph | calculate → |
| 265/70R16 common | 30.61" | -1.46% | +40 mm | 59.1 mph | calculate → |
| 235/85R16 common | 31.73" | +2.15% | +10 mm | 61.3 mph | calculate → |
| 215/85R16 common | 30.39" | -2.15% | -10 mm | 58.7 mph | calculate → |
| 255/70R16 common | 30.06" | -3.23% | +30 mm | 58.1 mph | calculate → |
| 235/75R16 | 29.88" | -3.80% | +10 mm | 57.7 mph | calculate → |
| 275/70R16 | 31.16" | +0.32% | +50 mm | 60.2 mph | calculate → |
| 235/80R16 | 30.80" | -0.82% | +10 mm | 59.5 mph | calculate → |
| 31x12.50R16 | 31.00" | -0.19% | +93 mm | 59.9 mph | calculate → |
| 285/65R16 | 30.59" | -1.52% | +60 mm | 59.1 mph | calculate → |
| 285/70R16 | 31.71" | +2.09% | +60 mm | 61.3 mph | calculate → |
| 32x11.50R16 | 32.00" | +3.03% | +67 mm | 61.8 mph | calculate → |
| 31x10.50R16 | 31.00" | -0.19% | +42 mm | 59.9 mph | calculate → |
| 31x11.50R16 | 31.00" | -0.19% | +67 mm | 59.9 mph | calculate → |
| 31x11.00R16 | 31.00" | -0.19% | +54 mm | 59.9 mph | calculate → |
| 225/90R16 | 31.94" | +2.85% | 0 mm | 61.7 mph | calculate → |
| 32x10.00R16 | 32.00" | +3.03% | +29 mm | 61.8 mph | calculate → |
| 32x9.00R16 | 32.00" | +3.03% | +4 mm | 61.8 mph | calculate → |
| 30x11.50R16 | 30.00" | -3.41% | +67 mm | 58.0 mph | calculate → |
Plus / minus sizing: 15" and 17" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 31x10.50R15 common | 31.00" | -0.19% | +42 mm | 59.9 mph | calculate → |
| 255/70R17 common | 31.06" | -0.01% | +30 mm | 60.0 mph | calculate → |
| 235/75R17 | 30.88" | -0.58% | +10 mm | 59.7 mph | calculate → |
| 275/65R17 | 31.07" | +0.05% | +50 mm | 60.0 mph | calculate → |
| 31x12.50R15 | 31.00" | -0.19% | +93 mm | 59.9 mph | calculate → |
| 31x10.50R17 | 31.00" | -0.19% | +42 mm | 59.9 mph | calculate → |
| 31x11.50R15 | 31.00" | -0.19% | +67 mm | 59.9 mph | calculate → |
| 31x11.00R15 | 31.00" | -0.19% | +54 mm | 59.9 mph | calculate → |
| 31x13.50R15 | 31.00" | -0.19% | +118 mm | 59.9 mph | calculate → |
| 31x13.00R15 | 31.00" | -0.19% | +105 mm | 59.9 mph | calculate → |
| 31x16.50R15 | 31.00" | -0.19% | +194 mm | 59.9 mph | calculate → |
| 31x16.00R15 | 31.00" | -0.19% | +181 mm | 59.9 mph | calculate → |
| 31x18.00R15 | 31.00" | -0.19% | +232 mm | 59.9 mph | calculate → |
| 31x9.50R15 | 31.00" | -0.19% | +16 mm | 59.9 mph | calculate → |
| 31x14.50R15 | 31.00" | -0.19% | +143 mm | 59.9 mph | calculate → |
| 31x18.50R15 | 31.00" | -0.19% | +245 mm | 59.9 mph | calculate → |
Try another size against 225/85R16
Questions
What size is 225/85R16 in inches?
225/85R16 is about 31.1" tall and 8.9" wide on a 16-inch rim — roughly a 31x9.00R16 in inch sizing.
What does 225/85R16 mean?
225 mm section width, sidewall 85% of the width (7.53"), radial construction, 16-inch rim.
What tire sizes are equivalent to 225/85R16?
On the same 16" rim, within 3% of the diameter: 31x10.50R16 (-0.19%), 31x11.50R16 (-0.19%), 31x11.00R16 (-0.19%), 31x12.50R16 (-0.19%), 275/70R16 (+0.32%), 235/80R16 (-0.82%).
How many revolutions per mile does a 225/85R16 tire make?
About 649 revolutions per mile (circumference 97.6").
How these numbers are computed
Diameter = rim + 2 × sidewall, sidewall = width × aspect ÷ 100, circumference = π × diameter, revolutions per mile = 63,360 ÷ circumference. Real tires differ by brand by a few tenths of an inch. Last reviewed October 14, 2026.