tireheight.com325/65R18 in inches
A 325/65R18 tire is 34.6″ tall and 12.8″ wide, and fits a 18″ wheel. In inches it is written 34.6×12.8R18.
How tall 325/65R18 tires really are
Heights published by BFGoodrich and Toyo for all 2 tires in this size. Their published revolutions per mile work out to 33.6″ under load (below).
Real 325/65R18 tires measure 34.60–34.61″, against 34.63″ from the size code. Every one runs shorter than the size code.
Published revs per mile (600–601) mean the tire rolls like a 33.6″ tire on the vehicle. Use this for speedometer calibration.
The lightest (Toyo Open Country A/T III, LT E) is 1.6 lb lighter per corner than the heaviest (BFGoodrich All-Terrain T/A KO3, LT F).
2 tires in 325/65R18
Sort by the spec you care about.
Is 325/65R18 a 35-inch tire?
Close. The size code works out to 34.63″, and the 2 tires here publish 34.60–34.61″, so people call it a 35.
All 35-inch tire sizes, on every wheel size.
A true 35×12.50R18 is 0.37″ taller on paper and 0.3″ narrower.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
| Size | Diameter ″ | vs 325/65R18 | Difference |
|---|---|---|---|
| 305/65R18 | 33.61 | -1.02″ | -3.0% |
| 285/70R18 | 33.71 | -0.93″ | -2.7% |
| 295/70R18 | 34.26 | -0.37″ | -1.1% |
| 315/70R17 | 34.36 | -0.27″ | -0.8% |
| 295/75R17 | 34.42 | -0.21″ | -0.6% |
| 305/70R18 | 34.81 | +0.18″ | +0.5% |
| 285/75R18 | 34.83 | +0.20″ | +0.6% |
| 35×12.50R18 | 35.00 | +0.37″ | +1.1% |
| 35×10.50R17 | 35.00 | +0.37″ | +1.1% |
| 315/70R18 | 35.36 | +0.73″ | +2.1% |
How to read 325/65R18
Marks a light truck (LT) tire.
A percentage, not a measurement: the sidewall is 65% as tall as the tire is wide, which is 211.3 mm or 8.32 inches.
Radial construction.
Mounts on a 18-inch wheel. Approved wheel widths run 9.0″ to 11.5″.
Each tire carries up to 3,970 lb (1,800 kg) at its maximum pressure.
Rated for up to 112 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 3,970 lb each, as published.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 34.63 | 880 mm |
| Section width | 12.80 | 325 mm |
| Sidewall height | 8.32 | 211.3 mm |
| Circumference | 108.8 | 2,764 mm |
| Revolutions per mile (calculated, unloaded) | 582.3 | 362 per km |
| Revolutions per mile (published by manufacturers) | 600–601 | 373 per km |
| Approved wheel width | 9.0–11.5 | 229–292 mm |
Speedometer error after switching to 325/65R18
Questions about 325/65R18
What is 325/65R18 in inches?
34.63 inches tall, 12.80 inches wide, on a 18-inch wheel. Written in inches, that is roughly 34.6×12.8R18.
How much does a 325/65R18 tire weigh?
Between 71.8 lb and 73.4 lb for the 2 tires listed here. The lightest is the Toyo Open Country A/T III (LT E); the heaviest is the BFGoodrich All-Terrain T/A KO3 (LT F).
What wheel width do I need for 325/65R18?
Manufacturers approve 9.0–11.5″ wide wheels for this size.
How many revolutions per mile does a 325/65R18 make?
Published figures run 600–601 revolutions per mile. The calculated figure is 582.3, but manufacturers measure the tire under load, where it rolls on a smaller radius.
How much taller is 325/65R18 than 295/70R18?
0.37 inches taller on paper (34.63″ vs 34.26″), which raises the axle about 0.19″. Your speedometer will read about 1.1% slow.