33x12.50R17 tire size in inches
A 33x12.50R17 tire is 33.00 inches tall and 12.50 inches wide on a 17-inch rim. These are nominal dimensions from the official sizing formula.
| Dimension | 33x12.50R17 | This size vs yours | |
|---|---|---|---|
| Overall diameter Numbers in the size | 33.00 in 838.2 mm | ||
| Section width Numbers in the size | 12.50 in 317.5 mm | ||
| Sidewall height Numbers in the size | 8.00 in 203.2 mm | ||
| Rim diameter Marked on the tire | 17 in | ||
| Circumference From diameter | 103.67 in | ||
| Revolutions per mile From diameter | 611 |
Is 33x12.50R17 a 33-inch tire?
Yes. At 33.00 inches tall, 33x12.50R17 is commonly called a 33-inch tire. Inch-class names round to the nearest inch; the true nominal height is 33.00 in.
Speedometer change
Example: if your speedometer is calibrated for 285/70R17 and you fit 33x12.50R17, the tire is +0.9% in diameter, so your true speed differs from the reading as shown below. Enter your current size above to see your own figures.
| Reading | True speed | Difference |
|---|---|---|
| 30 mph | 30.3 mph | +0.3 mph |
| 45 mph | 45.4 mph | +0.4 mph |
| 55 mph | 55.5 mph | +0.5 mph |
| 60 mph | 60.5 mph | +0.5 mph |
| 70 mph | 70.6 mph | +0.6 mph |
| 80 mph | 80.7 mph | +0.7 mph |
Sizes within 3% of 33x12.50R17
These sizes are within 3% of the diameter of 33x12.50R17. The 3% figure is a rule of thumb, not a regulation and not a fitment check: wheel width, offset, suspension and body clearance decide what fits. See changing tire size.
| Size | Diameter (in) | Width (in) | Change | ±3% | Ride height (in) |
|---|---|---|---|---|---|
| 255/75R17 | 32.06 | 10.04 | −2.9% | −0.47 | |
| 275/65R18 | 32.07 | 10.83 | −2.8% | −0.46 | |
| 275/70R17 | 32.16 | 10.83 | −2.6% | −0.42 | |
| 285/55R20 | 32.34 | 11.22 | −2.0% | −0.33 | |
| 265/60R20 | 32.52 | 10.43 | −1.5% | −0.24 | |
| 33x12.50R15 | 32.52 | 12.52 | −1.5% | −0.24 | |
| 285/65R18 | 32.59 | 11.22 | −1.3% | −0.21 | |
| 265/70R18 | 32.61 | 10.43 | −1.2% | −0.20 | |
| 285/70R17 | 32.71 | 11.22 | −0.9% | −0.15 | |
| 295/55R20 | 32.78 | 11.61 | −0.7% | −0.11 | |
| 305/70R16 | 32.81 | 12.01 | −0.6% | −0.09 | |
| 285/75R16 | 32.83 | 11.22 | −0.5% | −0.08 | |
| 275/60R20 | 32.99 | 10.83 | 0.0% | 0.00 | |
| 33x12.50R17 | 33.00 | 12.50 | — | — | |
| 255/85R16 | 33.07 | 10.04 | +0.2% | +0.03 | |
| 275/70R18 | 33.16 | 10.83 | +0.5% | +0.08 | |
| 305/55R20 | 33.21 | 12.01 | +0.6% | +0.10 | |
| 295/70R17 | 33.26 | 11.61 | +0.8% | +0.13 | |
| 295/75R16 | 33.42 | 11.61 | +1.3% | +0.21 | |
| 285/60R20 | 33.46 | 11.22 | +1.4% | +0.23 | |
| 285/70R18 | 33.71 | 11.22 | +2.1% | +0.35 | |
| 305/70R17 | 33.81 | 12.01 | +2.5% | +0.41 | |
| 285/75R17 | 33.83 | 11.22 | +2.5% | +0.42 | |
| 295/60R20 | 33.94 | 11.61 | +2.8% | +0.47 |
Metric equivalent of 33x12.50R17
These metric sizes are within 2% of the diameter of 33x12.50R17. Same rim first.
| Metric size | Diameter (in) | Change | Width (in) | Rim (in) |
|---|---|---|---|---|
| 255/80R17 | 33.06 | +0.2% | 10.04 | 17 |
| 275/75R17 | 33.24 | +0.7% | 10.83 | 17 |
| 295/70R17 | 33.26 | +0.8% | 11.61 | 17 |
| 285/70R17 | 32.71 | −0.9% | 11.22 | 17 |
| 265/75R17 | 32.65 | −1.1% | 10.43 | 17 |
| 305/65R17 | 32.61 | −1.2% | 12.01 | 17 |
How 33x12.50R17 is calculated
33x12.50R17 is not in the UN R54 table of US high flotation sizes, so these are the numbers in the size: 33.00 in tall and 12.50 in wide. Check the tire maker's specification for the real diameter.
Sidewall = (diameter − rim) ÷ 2 = (33.00 − 17) ÷ 2 = 8.00 in.
Inch sizes: see inch tire sizes explained. Revolutions per mile = 63,360 ÷ circumference. Full sources are listed at the end of this page.
Questions about 33x12.50R17
- How tall is a 33x12.50R17 tire?
- 33.00 inches (838.2 mm) nominal. Check the maker's specification for a specific tire.
- How wide is a 33x12.50R17 tire?
- 12.50 inches (317.5 mm) section width. Overall width can be slightly larger; for passenger tires, US rule FMVSS 139 allows 7% over the specified width (or 10 mm, if larger, for some pressure classes).
- How many revolutions per mile does 33x12.50R17 make?
- About 611 nominal, from a circumference of 103.67 in. Tire makers publish measured revolutions per mile for each tire.
- Will 33x12.50R17 fit my vehicle?
- This page can't tell you. Check the tire size on your door-jamb placard, then confirm wheel width, offset and clearance with the tire or vehicle maker.
Related
- All 17" sizes
- 255/75R17 vs 33x12.50R17
- Tire size chart
- Wheel offset calculator
- Re-gear calculator
- Plus-size calculator
Printed from https://tiresizecalc.net/size/33x12-50r17/. Figures as published on 2026-11-01. The full working and the official sources are on that page.
Sources
This size is listed by the manufacturer: BFGoodrich All-Terrain T/A KO3, checked on the manufacturer's site on 2026-11-01. The size page shows nominal figures, not that product's measurements.
- UN Regulation No. 30 - Uniform provisions concerning the approval of pneumatic tyres for motor vehicles and their trailers (Revision 3). United Nations Economic Commission for Europe (UNECE). E/ECE/324 E/ECE/TRANS/505 Rev.1/Add.29/Rev.3. 2007-03-29. Para 2.15 and 6.1.2.1: aspect ratio and outer diameter, D = d + 2H. Retrieved 2026-11-01.
- UN Regulation No. 54 - Uniform provisions concerning the approval of pneumatic tyres for commercial vehicles and their trailers (Revision 2). United Nations Economic Commission for Europe (UNECE). E/ECE/324 E/ECE/TRANS/505 Rev.1/Add.53/Rev.2. 2004-04-16. Para 6.1.2.1: the same formula for light truck tires. Retrieved 2026-11-01.
- UN Regulation No. 30 - Uniform provisions concerning the approval of pneumatic tyres for motor vehicles and their trailers (Revision 3). United Nations Economic Commission for Europe (UNECE). E/ECE/324 E/ECE/TRANS/505 Rev.1/Add.29/Rev.3. 2007-03-29. Para 6.1.5: allowed outer diameter, Dmin = d + 2H x 0.97, Dmax = d + 2H x 1.04. Retrieved 2026-11-01.
- UN Regulation No. 54 - Uniform provisions concerning the approval of pneumatic tyres for commercial vehicles and their trailers (Revision 2). United Nations Economic Commission for Europe (UNECE). E/ECE/324 E/ECE/TRANS/505 Rev.1/Add.53/Rev.2. 2004-04-16. Annex 5 Part II Table B: design outer diameter and section width of 33x12.50R15LT. Retrieved 2026-11-01.
- UN Regulation No. 54 - Uniform provisions concerning the approval of pneumatic tyres for commercial vehicles and their trailers (Revision 2). United Nations Economic Commission for Europe (UNECE). E/ECE/324 E/ECE/TRANS/505 Rev.1/Add.53/Rev.2. 2004-04-16. Para 6.1.5.1, 6.1.5.3.1 and Table B note 2: allowed outer diameter for table sizes. Retrieved 2026-11-01.
- Computed by tiresizecalc.net from the cited formula. Sri Murugan Systems. Not in UN R54 Annex 5 Table B: diameter and width of 33x12.50R17 are the numbers in the size. Retrieved 2026-11-01.
- Computed by tiresizecalc.net from the cited formula. Sri Murugan Systems. Circumference = pi x diameter; revolutions per mile = 63,360 / circumference; 1 in = 25.4 mm exactly. Retrieved 2026-11-01.
- 49 CFR 571.139 - Standard No. 139; New pneumatic radial tires for light vehicles. National Highway Traffic Safety Administration (NHTSA), Code of Federal Regulations (eCFR). 49 CFR 571.139. eCFR up to date as of 2026-10-15. S6.1.2: passenger tire width up to 7 percent (or 10 mm) over the specified width. Retrieved 2026-11-01.
- 49 CFR 571.110 - Standard No. 110; Tire selection and rims for motor vehicles with a GVWR of 4,536 kilograms (10,000 pounds) or less. National Highway Traffic Safety Administration (NHTSA), Code of Federal Regulations, annual edition (GovInfo). 2006-10-01. S4.3: the door placard shows the original tire size. Retrieved 2026-11-01.
Last reviewed 2026-11-01. The full source list, with dates and file checksums, is in How the numbers are calculated. To report an error, email contactus@tiresizecalc.net.