tireheight.com245/70R18 in inches
A 245/70R18 tire is 31.5″ tall and 9.6″ wide, and fits a 18″ wheel. In inches it is written 31.5×9.6R18.
How tall 245/70R18 tires really are
Heights published by BFGoodrich and Michelin for all 2 tires in this size. Their published revolutions per mile work out to 30.6″ under load (below).
Real 245/70R18 tires measure 31.50–31.54″, against 31.50″ from the size code. They run both taller and shorter than the size code.
Published revs per mile (659) mean the tire rolls like a 30.6″ tire on the vehicle. Use this for speedometer calibration.
The lightest (Michelin X-Ice Snow, SL) is 13.4 lb lighter per corner than the heaviest (BFGoodrich All-Terrain T/A KO3, LT D).
2 tires in 245/70R18
Sort by the spec you care about.
Is 245/70R18 a 32-inch tire?
Close. The size code works out to 31.50″, and the 2 tires here publish 31.50–31.54″, so people call it a 32.
All 32-inch tire sizes, on every wheel size.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
How to read 245/70R18
Marks a light truck (LT) tire.
A percentage, not a measurement: the sidewall is 70% as tall as the tire is wide, which is 171.5 mm or 6.75 inches.
Radial construction.
Mounts on a 18-inch wheel. Approved wheel widths run 6.5″ to 8.0″.
Each tire carries up to 2,679 lb (1,215 kg) at its maximum pressure.
Rated for up to 112 mph sustained.
Printed separately as "LOAD RANGE D": a 8-ply rating, inflated up to 65 psi (standard load-range table). The load range D tires here carry up to 2,680 lb each, as published.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 31.50 | 800 mm |
| Section width | 9.65 | 245 mm |
| Sidewall height | 6.75 | 171.5 mm |
| Circumference | 99.0 | 2,514 mm |
| Revolutions per mile (calculated, unloaded) | 640.2 | 398 per km |
| Revolutions per mile (published by manufacturers) | 659 | 409 per km |
| Approved wheel width | 6.5–8.0 | 165–203 mm |
Speedometer error after switching to 245/70R18
Questions about 245/70R18
What is 245/70R18 in inches?
31.50 inches tall, 9.65 inches wide, on a 18-inch wheel. Written in inches, that is roughly 31.5×9.6R18.
How much does a 245/70R18 tire weigh?
Between 36.5 lb and 49.9 lb for the 2 tires listed here. The lightest is the Michelin X-Ice Snow (SL); the heaviest is the BFGoodrich All-Terrain T/A KO3 (LT D).
What wheel width do I need for 245/70R18?
Manufacturers approve 6.5–8.0″ wide wheels for this size.
How many revolutions per mile does a 245/70R18 make?
Published figures run 659 revolutions per mile. The calculated figure is 640.2, but manufacturers measure the tire under load, where it rolls on a smaller radius.
What is the difference between P245/70R18 and LT245/70R18?
Passenger tires (1 here) are built for passenger loads, with max loads of 2337 lb. Light-truck tires (1 here) come in heavier load ranges with max loads of 2680 lb, and are usually heavier with deeper tread.
How much taller is 245/70R18 than 285/60R18?
0.04 inches taller on paper (31.50″ vs 31.46″), which raises the axle about 0.02″. Your speedometer will read about 0.1% slow.