tireheight.com265/40R18 in inches
A 265/40R18 tire is 26.3″ tall and 10.4″ wide, and fits a 18″ wheel. In inches it is written 26.3×10.4R18.
How tall 265/40R18 tires really are
Heights published by BFGoodrich, Michelin and Toyo for all 7 tires in this size. Their published revolutions per mile work out to 25.5–25.6″ under load (below).
Real 265/40R18 tires measure 26.30–26.34″, against 26.35″ from the size code. They run both taller and shorter than the size code.
Published revs per mile (789–790) mean the tire rolls like a 25.5–25.6″ tire on the vehicle. Use this for speedometer calibration.
The lightest (Michelin Pilot Sport PS2, XL) is 3.7 lb lighter per corner than the heaviest (Toyo Proxes Sport A/S, XL).
7 tires in 265/40R18
Sort by the spec you care about.
| Load | Revs/mi | Source | |||||
|---|---|---|---|---|---|---|---|
| Michelin Pilot Sport PS2Performance | XL · 101(Y) | 26.30 | 26.5 | 8.5 | 1,819 | 790 | Spec page |
| Michelin Pilot Alpin PA4Winter | XL · 101V | 26.34 | 26.9 | 10.5 | 1,819 | 790 | Spec page |
| Michelin Pilot Sport All-Season 4Performance | XL · 101Y | 26.30 | 27.1 | 10.0 | 1,819 | 790 | Spec page |
| Michelin Pilot Super SportPerformance | XL · 101Y | 26.30 | 27.1 | 10.0 | 1,819 | 790 | Spec page |
| Michelin Pilot Sport 4 SPerformance | XL · 101(Y) | 26.30 | 27.3 | 9.5 | 1,819 | 790 | Spec page |
| BFGoodrich g-Force Phenom T/APerformance | XL · 101Y | 26.34 | 28.1 | 8.0 | 1,819 | 790 | Spec page |
| Toyo Proxes Sport A/SPerformance | XL · 101Y | 26.34 | 30.2 | 9.7 | 1,819 | 789 | Spec page |
Is 265/40R18 a 26-inch tire?
Yes. The size code works out to 26.35″, and the 7 tires here publish 26.30–26.34″, so people call it a 26.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
How to read 265/40R18
A percentage, not a measurement: the sidewall is 40% as tall as the tire is wide, which is 106.0 mm or 4.17 inches.
Radial construction.
Mounts on a 18-inch wheel. Approved wheel widths run 9.0″ to 10.5″.
Each tire carries up to 1,819 lb (825 kg) at its maximum pressure.
Rated for up to 186 mph sustained.
Printed after the size.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 26.35 | 669 mm |
| Section width | 10.43 | 265 mm |
| Sidewall height | 4.17 | 106.0 mm |
| Circumference | 82.8 | 2,102 mm |
| Revolutions per mile (calculated, unloaded) | 765.5 | 476 per km |
| Revolutions per mile (published by manufacturers) | 789–790 | 490–491 per km |
| Approved wheel width | 9.0–10.5 | 229–267 mm |
Speedometer error after switching to 265/40R18
Questions about 265/40R18
What is 265/40R18 in inches?
26.35 inches tall, 10.43 inches wide, on a 18-inch wheel. Written in inches, that is roughly 26.3×10.4R18.
How much does a 265/40R18 tire weigh?
Between 26.5 lb and 30.2 lb for the 7 tires listed here. The lightest is the Michelin Pilot Sport PS2 (XL); the heaviest is the Toyo Proxes Sport A/S (XL).
What wheel width do I need for 265/40R18?
Manufacturers approve 9.0–10.5″ wide wheels for this size.
How many revolutions per mile does a 265/40R18 make?
Published figures run 789–790 revolutions per mile. The calculated figure is 765.5, but manufacturers measure the tire under load, where it rolls on a smaller radius.
How much taller is 265/40R18 than 235/45R18?
0.02 inches taller on paper (26.35″ vs 26.33″), which raises the axle about 0.01″. Your speedometer will read about 0.1% slow.