tireheight.com

31×10.50R15 in inches

A 31×10.50R15 tire is 31.0″ tall and 10.5″ wide, and fits a 15″ wheel.

Diameter31.00″
Width10.50″
Sidewall8.00″
31×10.50R15 drawn to scale: 31.00 inch diameter, 8.00 inch sidewall, 15 inch wheel, 10.50 inch tread width15″ wheel8.00″31.00″ overall10.50″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 31×10.50R15 tires really are

Heights published by BFGoodrich, General, Michelin, Mickey Thompson and Toyo for all 8 tires in this size. Their published revolutions per mile work out to 29.6–30.2″ under load (below).

Real 31×10.50R15 tires measure 30.50–31.10″, against 31.00″ from the size code. Most run shorter than the size code (6 of 8).

  1. Toyo Open Country M/T31.10″ +0.10″
  2. General Grabber A/TX31.00″ +0.00″
  3. Mickey Thompson Baja Legend EXP30.80″ −0.20″
  4. Mickey Thompson Baja Legend MTZ30.80″ −0.20″
  5. Toyo Open Country A/T III30.75″ −0.25″
  6. Michelin Defender LTX M/S30.70″ −0.30″
  7. BFGoodrich All-Terrain T/A KO330.50″ −0.50″
  8. BFGoodrich Mud-Terrain T/A KM330.50″ −0.50″
Each bar runs from the size code's 31.00″ (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 load29.6–30.2″

Published revs per mile (667–682) mean the tire rolls like a 29.6–30.2″ tire on the vehicle. Use this for speedometer calibration.

Weight spread42.6–56.8 lb

The lightest (Michelin Defender LTX M/S, LT C) is 14.2 lb lighter per corner than the heaviest (Toyo Open Country M/T, LT C).

8 tires in 31×10.50R15

Sort by the spec you care about.

LoadRevs/miSource
Michelin Defender LTX M/SAll-seasonLT C · 109R30.7042.613.52,271682Spec page
Toyo Open Country A/T IIIAll-terrainLT C · 109S30.7543.015.62,270676Spec page
General Grabber A/TXAll-terrainLT C · 109S31.0043.917.02,270670Spec page
Mickey Thompson Baja Legend EXPAll-terrainLT C · 109Q30.8045.018.52,270–Spec page
BFGoodrich All-Terrain T/A KO3All-terrainLT C · 109R30.5045.215.02,270682Spec page
Mickey Thompson Baja Legend MTZMud-terrainLT C · 109Q30.8047.020.02,270–Spec page
BFGoodrich Mud-Terrain T/A KM3Mud-terrainLT C · 109Q30.5050.618.02,270682Spec page
Toyo Open Country M/TMud-terrainLT C · 109Q31.1056.819.12,270667Spec page

Is a 31×10.50R15 really 31 inches tall?

30.8″

Mostly. The name says 31″, and the 8 tires here publish 30.50–31.10″.

All 31-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 31×10.50R15Difference
30×10.00R1530.00-1.00″-3.2%
30×9.50R1530.00-1.00″-3.2%
215/85R1630.39-0.61″-2.0%
245/75R1630.47-0.53″-1.7%
265/70R1630.61-0.39″-1.3%
265/75R1530.65-0.35″-1.1%
275/70R1631.16+0.16″+0.5%
32×10.00R1532.00+1.00″+3.2%
32×11.50R1532.00+1.00″+3.2%
32×9.50R1532.00+1.00″+3.2%

How to read 31×10.50R15

How to read any tire size

31X10.50R15LT 109Q as printed on the tire sidewall, with each part numbered31X10.50R15LT 109Q1234567
How 31X10.50R15LT 109Q is printed on the sidewall. It's the most common code among the 8 tires here (4 of them); tires in this size come in other load and speed ratings too.
131Overall diameter

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

210.50Section width

10.50 inches across the widest point, or 267 mm.

3RConstruction

Radial construction.

415Wheel diameter

Mounts on a 15-inch wheel. Approved wheel widths run 7.0″ to 9.0″.

5LTLight truck

Marks a light truck (LT) tire.

6109Load index

Each tire carries up to 2,271 lb (1,030 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 2,271 lb each, as published.

SpecificationInchesMetric
Overall diameter31.00787 mm
Section width10.50267 mm
Sidewall height8.00203.2 mm
Circumference97.42,474 mm
Revolutions per mile (calculated, unloaded)650.6404 per km
Revolutions per mile (published by manufacturers)667–682415–424 per km
Approved wheel width7.0–9.0178–229 mm

Speedometer error after switching to 31×10.50R15

Your actual speed– mph

Questions about 31×10.50R15

What is 31×10.50R15 in inches?

31.00 inches tall, 10.50 inches wide, on a 15-inch wheel. Manufacturers publish 30.50–31.10 inches for the 8 tires listed here.

How much does a 31×10.50R15 tire weigh?

Between 42.6 lb and 56.8 lb for the 8 tires listed here. The lightest is the Michelin Defender LTX M/S (LT C); the heaviest is the Toyo Open Country M/T (LT C).

What wheel width do I need for 31×10.50R15?

Manufacturers approve 7.0–9.0″ wide wheels for this size.

How many revolutions per mile does a 31×10.50R15 make?

Published figures run 667–682 revolutions per mile. The calculated figure is 650.6, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 31×10.50R15 than 265/75R15?

0.35 inches taller on paper (31.00″ vs 30.65″), which raises the axle about 0.18″. Your speedometer will read about 1.1% slow.