tireheight.com

305/65R17 in inches

A 305/65R17 tire is 32.6″ tall and 12.0″ wide, and fits a 17″ wheel. In inches it is written 32.6×12.0R17.

Diameter32.61″
Width12.01″
Sidewall7.81″
305/65R17 drawn to scale: 32.61 inch diameter, 7.81 inch sidewall, 17 inch wheel, 12.01 inch tread width17″ wheel7.81″32.61″ overall12.01″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 305/65R17 tires really are

Heights published by BFGoodrich and Mickey Thompson for all 5 tires in this size. Their published revolutions per mile work out to 31.6″ under load (below).

Real 305/65R17 tires measure 32.60–32.90″, against 32.61″ from the size code. Most run taller than the size code (4 of 5).

  1. Mickey Thompson Baja Legend EXP32.90″ +0.29″
  2. Mickey Thompson Baja Boss A/T32.80″ +0.19″
  3. Mickey Thompson Baja Boss M/T32.70″ +0.09″
  4. Mickey Thompson Baja Legend MTZ32.70″ +0.09″
  5. BFGoodrich All-Terrain T/A KO232.60″ −0.01″
Each bar runs from the size code's 32.61″ (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 load31.6″

Published revs per mile (638) mean the tire rolls like a 31.6″ tire on the vehicle. Use this for speedometer calibration.

Weight spread58.5–67.0 lb

The lightest (BFGoodrich All-Terrain T/A KO2, LT E) is 8.5 lb lighter per corner than the heaviest (Mickey Thompson Baja Boss A/T, LT E).

5 tires in 305/65R17

Sort by the spec you care about.

LoadRevs/miSource
BFGoodrich All-Terrain T/A KO2All-terrainLT E · 121/118R32.6058.515.03,195638Spec page
Mickey Thompson Baja Legend EXPAll-terrainLT E · 121Q32.9060.018.53,195–Spec page
Mickey Thompson Baja Legend MTZMud-terrainLT E · 121Q32.7064.021.03,195–Spec page
Mickey Thompson Baja Boss A/TAll-terrainLT E · 121Q32.8067.018.53,195–Spec page
Mickey Thompson Baja Boss M/TMud-terrainLT E · 121Q32.7067.021.03,195–Spec page

Is 305/65R17 a 33-inch tire?

≈33″

Yes. The size code works out to 32.61″, and the 5 tires here publish 32.60–32.90″, so people call it a 33.

All 33-inch tire sizes, on every wheel size.

A true 33×12.50R17 is 0.39″ taller on paper and 0.5″ wider.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 305/65R17Difference
235/80R1731.80-0.81″-2.5%
255/75R1732.06-0.55″-1.7%
275/70R1732.16-0.45″-1.4%
285/65R1832.59-0.02″-0.1%
265/70R1832.61-0.00″-0.0%
285/70R1732.71+0.10″+0.3%
33×12.50R1733.00+0.39″+1.2%
33×15.50R1733.00+0.39″+1.2%
255/80R1733.06+0.45″+1.4%
295/70R1733.26+0.65″+2.0%

How to read 305/65R17

How to read any tire size

LT305/65R17 121Q as printed on the tire sidewall, with each part numberedLT305/65R17 121Q1234567
How LT305/65R17 121Q is printed on the sidewall. It's the most common code among the 5 tires here (4 of them); tires in this size come in other load and speed ratings too.
1LTLight truck

Marks a light truck (LT) tire.

2305Section width

305 mm across the widest point, or 12.01 inches. Every 305 size

365Aspect ratio

A percentage, not a measurement: the sidewall is 65% as tall as the tire is wide, which is 198.3 mm or 7.81 inches.

4RConstruction

Radial construction.

517Wheel diameter

Mounts on a 17-inch wheel. Approved wheel widths run 8.5″ to 11.0″.

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.

ELoad range

Printed separately as "LOAD RANGE E": a 10-ply rating, inflated up to 80 psi (standard load-range table). The load range E tires here carry up to 3,195 lb each, as published.

SpecificationInchesMetric
Overall diameter32.61828 mm
Section width12.01305 mm
Sidewall height7.81198.3 mm
Circumference102.42,602 mm
Revolutions per mile (calculated, unloaded)618.5384 per km
Revolutions per mile (published by manufacturers)638396 per km
Approved wheel width8.5–11.0216–279 mm

Speedometer error after switching to 305/65R17

Your actual speed– mph

Questions about 305/65R17

What is 305/65R17 in inches?

32.61 inches tall, 12.01 inches wide, on a 17-inch wheel. Written in inches, that is roughly 32.6×12.0R17.

How much does a 305/65R17 tire weigh?

Between 58.5 lb and 67.0 lb for the 5 tires listed here. The lightest is the BFGoodrich All-Terrain T/A KO2 (LT E); the heaviest is the Mickey Thompson Baja Boss A/T (LT E).

What wheel width do I need for 305/65R17?

Manufacturers approve 8.5–11.0″ wide wheels for this size.

How many revolutions per mile does a 305/65R17 make?

Published figures run 638 revolutions per mile. The calculated figure is 618.5, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 305/65R17 than 275/70R17?

0.45 inches taller on paper (32.61″ vs 32.16″), which raises the axle about 0.23″. Your speedometer will read about 1.4% slow.