tireheight.com

40×13.50R17 in inches

A 40×13.50R17 tire is 40.0″ tall and 13.5″ wide, and fits a 17″ wheel.

Diameter40.00″
Width13.50″
Sidewall11.50″
40×13.50R17 drawn to scale: 40.00 inch diameter, 11.50 inch sidewall, 17 inch wheel, 13.50 inch tread width17″ wheel11.50″40.00″ overall13.50″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 40×13.50R17 tires really are

Heights published by BFGoodrich, Mickey Thompson and Toyo for all 6 tires in this size. Their published revolutions per mile work out to 38.3–38.6″ under load (below).

Real 40×13.50R17 tires measure 39.50–39.80″, against 40.00″ from the size code. Every one runs shorter than the size code.

  1. Mickey Thompson Baja Boss M/T39.80″ −0.20″
  2. Mickey Thompson Baja Boss X39.80″ −0.20″
  3. Mickey Thompson Baja Boss XS39.80″ −0.20″
  4. Mickey Thompson Baja Legend MTZ39.80″ −0.20″
  5. Toyo Open Country M/T39.72″ −0.28″
  6. BFGoodrich Mud-Terrain T/A KM339.50″ −0.50″
Each bar runs from the size code's 40.00″ (the orange line) to the model's published height. The track spans 1.0″. Where a model comes in several load ranges, the darker part shows its range of heights; the number after the name is how many versions it comes in.
Height under load38.3–38.6″

Published revs per mile (522–526) mean the tire rolls like a 38.3–38.6″ tire on the vehicle. Use this for speedometer calibration.

Weight spread89.0–104.3 lb

The lightest (BFGoodrich Mud-Terrain T/A KM3, LT D) is 15.3 lb lighter per corner than the heaviest (Toyo Open Country M/T, LT C).

6 tires in 40×13.50R17

Sort by the spec you care about.

LoadRevs/miSource
BFGoodrich Mud-Terrain T/A KM3Mud-terrainLT D · 121Q39.5089.018.03,195526Spec page
Mickey Thompson Baja Legend MTZMud-terrainLT C · 121Q39.8091.022.03,195–Spec page
Mickey Thompson Baja Boss M/TMud-terrainLT C · 121Q39.8092.022.03,195–Spec page
Mickey Thompson Baja Boss XSLT B · 115Q39.80100.022.02,680–Spec page
Mickey Thompson Baja Boss XLT B · 115F39.80103.022.02,680–Spec page
Toyo Open Country M/TMud-terrainLT C · 121Q39.72104.321.03,195522Spec page

Is a 40×13.50R17 really 40 inches tall?

39.7″

Shorter. The name says 40″, and the 6 tires here publish 39.50–39.80″.

All 40-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 40×13.50R17Difference
38×11.50R1738.00-2.00″-5.0%
38×12.50R1738.00-2.00″-5.0%
38×11.50R1838.00-2.00″-5.0%
38×13.50R1838.00-2.00″-5.0%
38×15.50R1838.00-2.00″-5.0%
39×13.50R1739.00-1.00″-2.5%
40×12.50R1740.000.00″0.0%
40×13.50R1840.000.00″0.0%
42×13.50R1742.00+2.00″+5.0%
42×14.50R1742.00+2.00″+5.0%

How to read 40×13.50R17

How to read any tire size

40X13.50R17LT 121Q as printed on the tire sidewall, with each part numbered40X13.50R17LT 121Q1234567
How 40X13.50R17LT 121Q is printed on the sidewall. It's the most common code among the 6 tires here (3 of them); tires in this size come in other load and speed ratings too.
140Overall diameter

40 inches tall, measured on the approved wheel. Flotation sizes give every number in inches.

213.50Section width

13.50 inches across the widest point, or 343 mm.

3RConstruction

Radial construction.

417Wheel diameter

Mounts on a 17-inch wheel. Approved wheel widths run 8.5″ to 11.5″.

5LTLight truck

Marks a light truck (LT) tire.

6121Load index

Each tire carries up to 3,195 lb (1,450 kg) at its maximum pressure.

7QSpeed rating

Rated for up to 99 mph sustained.

CLoad range

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 3,195 lb each, as published.

SpecificationInchesMetric
Overall diameter40.001016 mm
Section width13.50343 mm
Sidewall height11.50292.1 mm
Circumference125.73,192 mm
Revolutions per mile (calculated, unloaded)504.2313 per km
Revolutions per mile (published by manufacturers)522–526324–327 per km
Approved wheel width8.5–11.5216–292 mm

Speedometer error after switching to 40×13.50R17

Your actual speed– mph

Questions about 40×13.50R17

What is 40×13.50R17 in inches?

40.00 inches tall, 13.50 inches wide, on a 17-inch wheel. Manufacturers publish 39.50–39.80 inches for the 6 tires listed here.

How much does a 40×13.50R17 tire weigh?

Between 89.0 lb and 104.3 lb for the 6 tires listed here. The lightest is the BFGoodrich Mud-Terrain T/A KM3 (LT D); the heaviest is the Toyo Open Country M/T (LT C).

What wheel width do I need for 40×13.50R17?

Manufacturers approve 8.5–11.5″ wide wheels for this size.

How many revolutions per mile does a 40×13.50R17 make?

Published figures run 522–526 revolutions per mile. The calculated figure is 504.2, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 40×13.50R17 than 39×13.50R17?

1.00 inches taller on paper (40.00″ vs 39.00″), which raises the axle about 0.50″. Your speedometer will read about 2.6% slow.