tireheight.com305/60R18 in inches
A 305/60R18 tire is 32.4″ tall and 12.0″ wide, and fits a 18″ wheel. In inches it is written 32.4×12.0R18.
How tall 305/60R18 tires really are
Heights published by Mickey Thompson and Toyo for all 5 tires in this size. Their published revolutions per mile work out to 31.5″ under load (below).
Real 305/60R18 tires measure 32.40–32.70″, against 32.41″ from the size code. Most run taller than the size code (4 of 5).
- Mickey Thompson Baja Boss M/T32.70″ +0.29″
- Mickey Thompson Baja Legend MTZ32.70″ +0.29″
- Mickey Thompson Baja Boss A/T32.60″ +0.19″
- Mickey Thompson Baja Legend EXP32.50″ +0.09″
- Toyo Open Country A/T III32.40″ −0.01″
Published revs per mile (641) mean the tire rolls like a 31.5″ tire on the vehicle. Use this for speedometer calibration.
The lightest (Toyo Open Country A/T III, SL) is 20.2 lb lighter per corner than the heaviest (Mickey Thompson Baja Boss A/T, LT F).
5 tires in 305/60R18
Sort by the spec you care about.
| Load | Revs/mi | Source | |||||
|---|---|---|---|---|---|---|---|
| Toyo Open Country A/T IIIAll-terrain | SL · 116S | 32.40 | 47.8 | 13.9 | 2,756 | 641 | Spec page |
| Mickey Thompson Baja Legend EXPAll-terrain | LT F · 126Q | 32.50 | 64.0 | 18.5 | 3,750 | – | Spec page |
| Mickey Thompson Baja Legend MTZMud-terrain | LT F · 126Q | 32.70 | 66.0 | 21.0 | 3,750 | – | Spec page |
| Mickey Thompson Baja Boss A/TAll-terrain | LT F · 126Q | 32.60 | 68.0 | 18.5 | 3,750 | – | Spec page |
| Mickey Thompson Baja Boss M/TMud-terrain | LT F · 126Q | 32.70 | 68.0 | 21.0 | 3,750 | – | Spec page |
Is 305/60R18 a 33-inch tire?
Close. The size code works out to 32.41″, and the 5 tires here publish 32.40–32.70″, so people call it a 33.
All 33-inch tire sizes, on every wheel size.
A true 33×12.50R18 is 0.59″ taller on paper and 0.5″ wider.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
How to read 305/60R18
Marks a light truck (LT) tire.
A percentage, not a measurement: the sidewall is 60% as tall as the tire is wide, which is 183.0 mm or 7.20 inches.
Radial construction.
Mounts on a 18-inch wheel. Approved wheel widths run 8.5″ to 11.0″.
Each tire carries up to 3,750 lb (1,700 kg) at its maximum pressure.
Rated for up to 99 mph sustained.
Printed separately as "LOAD RANGE F": a 12-ply rating, inflated up to 95 psi (standard load-range table). The load range F tires here carry up to 3,750 lb each, as published.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 32.41 | 823 mm |
| Section width | 12.01 | 305 mm |
| Sidewall height | 7.20 | 183.0 mm |
| Circumference | 101.8 | 2,586 mm |
| Revolutions per mile (calculated, unloaded) | 622.3 | 387 per km |
| Revolutions per mile (published by manufacturers) | 641 | 398 per km |
| Approved wheel width | 8.5–11.0 | 216–279 mm |
Speedometer error after switching to 305/60R18
Questions about 305/60R18
What is 305/60R18 in inches?
32.41 inches tall, 12.01 inches wide, on a 18-inch wheel. Written in inches, that is roughly 32.4×12.0R18.
How much does a 305/60R18 tire weigh?
Between 47.8 lb and 68.0 lb for the 5 tires listed here. The lightest is the Toyo Open Country A/T III (SL); the heaviest is the Mickey Thompson Baja Boss A/T (LT F).
What wheel width do I need for 305/60R18?
Manufacturers approve 8.5–11.0″ wide wheels for this size.
How many revolutions per mile does a 305/60R18 make?
Published figures run 641 revolutions per mile. The calculated figure is 622.3, but manufacturers measure the tire under load, where it rolls on a smaller radius.
What is the difference between P305/60R18 and LT305/60R18?
Passenger tires (1 here) are built for passenger loads, with max loads of 2756 lb. Light-truck tires (4 here) come in heavier load ranges with max loads of 3750 lb, and are usually heavier with deeper tread.
How much taller is 305/60R18 than 275/65R18?
0.33 inches taller on paper (32.41″ vs 32.07″), which raises the axle about 0.17″. Your speedometer will read about 1.0% slow.