tireheight.com38×12.50R17 in inches
A 38×12.50R17 tire is 38.0″ tall and 12.5″ wide, and fits a 17″ wheel.
How tall 38×12.50R17 tires really are
Heights published by Toyo for the one tire in this size. Their published revolutions per mile work out to 36.4″ under load (below).
The one tire listed, the Toyo Open Country R/T Trail, measures 37.50″: 0.50″ shorter than the size code's 38.00″.
Published revs per mile (554) mean the tire rolls like a 36.4″ tire on the vehicle. Use this for speedometer calibration.
1 tire in 38×12.50R17
Sort by the spec you care about.
Is a 38×12.50R17 really 38 inches tall?
Shorter. The name says 38″, and the 1 tire here publishes 37.50″.
All 38-inch tire sizes, on every wheel size.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
| Size | Diameter ″ | vs 38×12.50R17 | Difference |
|---|---|---|---|
| 37×12.50R17 | 37.00 | -1.00″ | -2.6% |
| 37×13.50R17 | 37.00 | -1.00″ | -2.6% |
| 37×12.50R18 | 37.00 | -1.00″ | -2.6% |
| 37×13.50R18 | 37.00 | -1.00″ | -2.6% |
| 385/70R16 | 37.22 | -0.78″ | -2.1% |
| 38×11.50R17 | 38.00 | 0.00″ | 0.0% |
| 38×11.50R18 | 38.00 | 0.00″ | 0.0% |
| 38×13.50R18 | 38.00 | 0.00″ | 0.0% |
| 38×15.50R18 | 38.00 | 0.00″ | 0.0% |
| 39×13.50R17 | 39.00 | +1.00″ | +2.6% |
How to read 38×12.50R17
38 inches tall, measured on the approved wheel. Flotation sizes give every number in inches.
12.50 inches across the widest point, or 318 mm.
Radial construction.
Mounts on a 17-inch wheel. Approved wheel widths run 8.0″ to 10.5″.
Marks a light truck (LT) tire.
Each tire carries up to 2,910 lb (1,320 kg) at its maximum pressure.
Rated for up to 106 mph sustained.
Printed separately as "LOAD RANGE C": a 6-ply rating, inflated up to 50 psi (standard load-range table). The load range C tires here carry up to 2,910 lb each, as published.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 38.00 | 965 mm |
| Section width | 12.50 | 318 mm |
| Sidewall height | 10.50 | 266.7 mm |
| Circumference | 119.4 | 3,032 mm |
| Revolutions per mile (calculated, unloaded) | 530.7 | 330 per km |
| Revolutions per mile (published by manufacturers) | 554 | 344 per km |
| Approved wheel width | 8.0–10.5 | 203–267 mm |
Speedometer error after switching to 38×12.50R17
Questions about 38×12.50R17
What is 38×12.50R17 in inches?
38.00 inches tall, 12.50 inches wide, on a 17-inch wheel. Manufacturers publish 37.50 inches for the 1 tires listed here.
What wheel width do I need for 38×12.50R17?
Manufacturers approve 8.0–10.5″ wide wheels for this size.
How many revolutions per mile does a 38×12.50R17 make?
Published figures run 554 revolutions per mile. The calculated figure is 530.7, but manufacturers measure the tire under load, where it rolls on a smaller radius.
How much taller is 38×12.50R17 than 37×13.50R17?
1.00 inches taller on paper (38.00″ vs 37.00″), which raises the axle about 0.50″. Your speedometer will read about 2.7% slow.