tireheight.com235/80R18 in inches
A 235/80R18 tire is 32.8″ tall and 9.3″ wide, and fits a 18″ wheel. In inches it is written 32.8×9.3R18.
How tall 235/80R18 tires really are
Heights published by BFGoodrich, Michelin and Toyo for all 4 tires in this size. Their published revolutions per mile work out to 31.8–31.9″ under load (below).
Real 235/80R18 tires measure 32.80″, against 32.80″ from the size code. They run both taller and shorter than the size code.
Published revs per mile (633–634) mean the tire rolls like a 31.8–31.9″ tire on the vehicle. Use this for speedometer calibration.
The lightest (Michelin Primacy XC, LT E) is 5.7 lb lighter per corner than the heaviest (BFGoodrich All-Terrain T/A KO3, LT E).
4 tires in 235/80R18
Sort by the spec you care about.
| Load | Revs/mi | Source | |||||
|---|---|---|---|---|---|---|---|
| Michelin Primacy XCAll-terrain | LT E · 121/118R | 32.80 | 45.5 | 12.0 | 3,195 | 634 | Spec page |
| Toyo Open Country A/T IIIAll-terrain | LT E · 121/118S | 32.80 | 45.9 | 16.0 | 3,195 | 633 | Spec page |
| Michelin Agilis CrossClimate 2Commercial | LT E · 121/118R | 32.80 | 49.2 | 14.0 | 3,195 | 634 | Spec page |
| BFGoodrich All-Terrain T/A KO3All-terrain | LT E · 121S | 32.80 | 51.2 | 16.0 | 3,195 | 634 | Spec page |
Is 235/80R18 a 33-inch tire?
Yes. The size code works out to 32.80″, and the 4 tires here publish 32.80″, so people call it a 33.
All 33-inch tire sizes, on every wheel size.
A true 33×12.50R18 is 0.20″ taller on paper and 3.2″ wider.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
How to read 235/80R18
Marks a light truck (LT) tire.
A percentage, not a measurement: the sidewall is 80% as tall as the tire is wide, which is 188.0 mm or 7.40 inches.
Radial construction.
Mounts on a 18-inch wheel. Approved wheel widths run 6.0″ to 8.0″.
Each tire carries up to 3,195 lb (1,450 kg) on its own, or 2,910 lb (1,320 kg) each when paired on a dual rear axle.
Rated for up to 106 mph sustained.
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.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 32.80 | 833 mm |
| Section width | 9.25 | 235 mm |
| Sidewall height | 7.40 | 188.0 mm |
| Circumference | 103.1 | 2,618 mm |
| Revolutions per mile (calculated, unloaded) | 614.8 | 382 per km |
| Revolutions per mile (published by manufacturers) | 633–634 | 393–394 per km |
| Approved wheel width | 6.0–8.0 | 152–203 mm |
Speedometer error after switching to 235/80R18
Questions about 235/80R18
What is 235/80R18 in inches?
32.80 inches tall, 9.25 inches wide, on a 18-inch wheel. Written in inches, that is roughly 32.8×9.3R18.
How much does a 235/80R18 tire weigh?
Between 45.5 lb and 51.2 lb for the 4 tires listed here. The lightest is the Michelin Primacy XC (LT E); the heaviest is the BFGoodrich All-Terrain T/A KO3 (LT E).
What wheel width do I need for 235/80R18?
Manufacturers approve 6.0–8.0″ wide wheels for this size.
How many revolutions per mile does a 235/80R18 make?
Published figures run 633–634 revolutions per mile. The calculated figure is 614.8, but manufacturers measure the tire under load, where it rolls on a smaller radius.
How much taller is 235/80R18 than 265/70R18?
0.20 inches taller on paper (32.80″ vs 32.61″), which raises the axle about 0.10″. Your speedometer will read about 0.6% slow.