Tire size in inches and millimeters
215/85R16 tire size in inches
A 215/85R16 tire is 30.39 inches tall (771.9 mm) and 8.46 inches wide (215 mm), with a 7.19-inch sidewall (182.8 mm). In inch notation that is about 30.4x8.5R16, close to a 30-inch tire (nominal).
Its circumference is 95.47 inches (2,425.0 mm), or about 664 revolutions per mile.
Nominal 215/85R16 dimensions
- Overall diameter
- 30.39 in771.9 mm
- Section width
- 8.46 in215 mm
- Sidewall height
- 7.19 in182.8 mm
- Circumference
- 95.47 in2,425.0 mm
- Rim diameter
- 16 in
- Revolutions per mile
- 664nominal, from geometric circumference
- Inch notation
- 30.4x8.5R16approximate
Where 215/85R16 fits
- Inch class: 30.39 in is near the top of the 30-inch class (29.50 to 30.49 in), so some listings call it a 31-inch tire.
- Profile: the 16-inch rim plus two 7.19 in sidewalls make up the overall diameter, and the sidewalls are 47% of it. At 85 series that is a very tall profile: the two sidewalls are close to half of the overall diameter.
- Same 16-inch rim: the next taller catalog size is 245/75R16 (30.47 in, +0.26%) and the next shorter is 255/70R16 (30.06 in, -1.10%).
- Same 215 mm width: the closest in diameter are 215/65R16 (27.00 in, -11.14%), 215/75R15 (27.70 in, -8.86%), 215/70R16 (27.85 in, -8.36%), 215/65R17 (28.00 in, -7.85%). At the same width, a different profile or rim changes sidewall height and overall diameter, not section width.
Reading the marking: 215 is the section width in millimeters, 85 is the sidewall height as a percentage of that width, and R16 means radial construction for a 16-inch rim. Percentages are measured from 215/85R16.
Similar sizes on other rim diameters
Within 3% of 215/85R16's overall diameter, nearest first. The speed column is the actual speed when a speedometer calibrated for 215/85R16 reads 60 mph.
| Size | Overall diameter | Diameter change | At 60 mph indicated | Compare |
|---|---|---|---|---|
| 245/70R17 | 30.50 in | +0.38% | 60.23 mph | No comparison page |
| 265/60R18 | 30.52 in | +0.43% | 60.26 mph | No comparison page |
| 265/65R17 | 30.56 in | +0.57% | 60.34 mph | No comparison page |
| 265/75R15 | 30.65 in | +0.86% | 60.51 mph | No comparison page |
| 255/65R17 | 30.05 in | -1.11% | 59.33 mph | No comparison page |
| 275/60R17 | 29.99 in | -1.31% | 59.21 mph | No comparison page |
For a size without a comparison page, open 215/85R16 in the calculator and enter that size as the proposed tire.
Important: These results compare nominal dimensions. They do not confirm vehicle fitment. Actual clearance varies by tire model, approved rim width, wheel construction, suspension, alignment, body tolerances, steering angle, load, and brake geometry. Verify load and speed ratings and physically test-fit the complete setup before driving.
Physical checks before changing size
- Approved rim-width range for the exact tire model
- Load index and speed rating equal to or greater than vehicle requirements
- Brake-caliper, hub, and wheel-fastener compatibility
- Fender, liner, suspension, and full-lock steering clearance
- Clearance at full compression and under expected load
- Alignment, tire pressure, and manufacturer guidance
- Professional inspection when variance or clearance is uncertain
Compare another setup
See diameter, speedometer, ride-height, and wheel-position changes.
The calculator opens with 215/85R16 as the current tire and 235/80R16, the published comparison closest in overall diameter, as the proposed tire. Change either size; wheel details stay unknown until you supply them.
Compare 215/85R16 with 235/80R16 in the calculatorPublished comparisons for 215/85R16
All keep the 16-inch rim. Diameter changes are measured from 215/85R16.
Same 16-inch rim
- 215/85R16 vs 235/80R16 +1.36% diameter
Size source and limits
Listed as a recorded tire size (source: NHTSA consumer-complaint records through May 2021, checked August 19, 2026; see methodology). A recorded size is not a safety, popularity, availability, or fitment rating.
Read the formulas and source policy. Read the editorial and corrections policy.