235/85R16 tire size
235/85R16 is a metric size: 31.7" tall, 9.3" wide, on a 16" rim — about a 31.5x9.50R16. The sidewall is 7.9" and the tire turns 636 times per mile.
235/85R16 specs
| Overall diameter (height) | 31.73" · 806 mm |
|---|---|
| Section width | 9.25" · 235 mm |
| Sidewall height | 7.86" · 200 mm (85% of width) |
| Rim diameter | 16" |
| Circumference | 99.68" · 2.532 m |
| Revolutions per mile | 636 (395 per km) |
| Inch (flotation) equivalent | 31.5x9.50R16 |
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" | -0.25% | +30 mm | 59.9 mph | compare → |
| 245/75R16 common | 30.47" | -3.97% | +10 mm | 57.6 mph | compare → |
| 265/70R16 common | 30.61" | -3.54% | +30 mm | 57.9 mph | compare → |
| 285/75R16 common | 32.83" | +3.47% | +50 mm | 62.1 mph | compare → |
| 215/85R16 common | 30.39" | -4.22% | -20 mm | 57.5 mph | compare → |
| 305/70R16 | 32.81" | +3.41% | +70 mm | 62.0 mph | compare → |
| 275/70R16 | 31.16" | -1.80% | +40 mm | 58.9 mph | compare → |
| 255/85R16 | 33.07" | +4.22% | +20 mm | 62.5 mph | compare → |
| 235/80R16 | 30.80" | -2.92% | 0 mm | 58.3 mph | calculate → |
| 33x10.50R16 | 33.00" | +4.01% | +32 mm | 62.4 mph | calculate → |
| 33x12.50R16 | 33.00" | +4.01% | +83 mm | 62.4 mph | calculate → |
| 285/70R16 | 31.71" | -0.06% | +50 mm | 60.0 mph | calculate → |
| 32x11.50R16 | 32.00" | +0.86% | +57 mm | 60.5 mph | calculate → |
| 31x12.50R16 | 31.00" | -2.30% | +83 mm | 58.6 mph | calculate → |
| 285/65R16 | 30.59" | -3.60% | +50 mm | 57.8 mph | calculate → |
| 33x11.50R16 | 33.00" | +4.01% | +57 mm | 62.4 mph | calculate → |
| 33x13.00R16 | 33.00" | +4.01% | +95 mm | 62.4 mph | calculate → |
| 225/90R16 | 31.94" | +0.68% | -10 mm | 60.4 mph | calculate → |
| 32x10.00R16 | 32.00" | +0.86% | +19 mm | 60.5 mph | calculate → |
| 32x9.00R16 | 32.00" | +0.86% | -6 mm | 60.5 mph | calculate → |
| 31x10.50R16 | 31.00" | -2.30% | +32 mm | 58.6 mph | calculate → |
| 31x11.50R16 | 31.00" | -2.30% | +57 mm | 58.6 mph | calculate → |
| 31x11.00R16 | 31.00" | -2.30% | +44 mm | 58.6 mph | calculate → |
| 265/80R16 | 32.69" | +3.04% | +30 mm | 61.8 mph | calculate → |
| 33x13.50R16 | 33.00" | +4.01% | +108 mm | 62.4 mph | calculate → |
| 33x14.50R16 | 33.00" | +4.01% | +133 mm | 62.4 mph | calculate → |
| 33x14.00R16 | 33.00" | +4.01% | +121 mm | 62.4 mph | calculate → |
| 33x9.50R16 | 33.00" | +4.01% | +6 mm | 62.4 mph | calculate → |
| 225/85R16 | 31.06" | -2.11% | -10 mm | 58.7 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 | |
|---|---|---|---|---|---|
| 265/70R17 common | 31.61" | -0.38% | +30 mm | 59.8 mph | compare → |
| 245/75R17 common | 31.47" | -0.82% | +10 mm | 59.5 mph | compare → |
| 235/80R17 common | 31.80" | +0.24% | 0 mm | 60.1 mph | compare → |
| 32x11.50R15 | 32.00" | +0.86% | +57 mm | 60.5 mph | compare → |
| 285/65R17 | 31.59" | -0.45% | +50 mm | 59.7 mph | calculate → |
| 315/60R17 | 31.88" | +0.48% | +80 mm | 60.3 mph | calculate → |
| 32x10.50R15 | 32.00" | +0.86% | +32 mm | 60.5 mph | calculate → |
| 32x10.00R15 | 32.00" | +0.86% | +19 mm | 60.5 mph | calculate → |
| 32x11.50R17 | 32.00" | +0.86% | +57 mm | 60.5 mph | calculate → |
| 32x14.00R15 | 32.00" | +0.86% | +121 mm | 60.5 mph | calculate → |
| 32x16.00R15 | 32.00" | +0.86% | +171 mm | 60.5 mph | calculate → |
| 32x17.50R15 | 32.00" | +0.86% | +210 mm | 60.5 mph | calculate → |
| 32x9.50R15 | 32.00" | +0.86% | +6 mm | 60.5 mph | calculate → |
| 32x10.50R17 | 32.00" | +0.86% | +32 mm | 60.5 mph | calculate → |
| 32x18.50R15 | 32.00" | +0.86% | +235 mm | 60.5 mph | calculate → |
Try another size against 235/85R16
Questions
What size is 235/85R16 in inches?
235/85R16 is about 31.7" tall and 9.3" wide on a 16-inch rim — roughly a 31.5x9.50R16 in inch sizing.
What does 235/85R16 mean?
235 mm section width, sidewall 85% of the width (7.86"), radial construction, 16-inch rim.
What tire sizes are equivalent to 235/85R16?
On the same 16" rim, within 3% of the diameter: 285/70R16 (-0.06%), 265/75R16 (-0.25%), 225/90R16 (+0.68%), 32x10.00R16 (+0.86%), 32x11.50R16 (+0.86%), 32x9.00R16 (+0.86%).
How many revolutions per mile does a 235/85R16 tire make?
About 636 revolutions per mile (circumference 99.7").
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.