tireheight.com215/45R18 in inches
A 215/45R18 tire is 25.6″ tall and 8.5″ wide, and fits a 18″ wheel. In inches it is written 25.6×8.5R18.
How tall 215/45R18 tires really are
Heights published by BFGoodrich, General, Michelin and Toyo for all 9 tires in this size. Their published revolutions per mile work out to 24.8–24.9″ under load (below).
Real 215/45R18 tires measure 25.60–25.90″, against 25.62″ from the size code. They run both taller and shorter than the size code.
- Michelin Pilot Sport All-Season 425.90″ +0.28″
- BFGoodrich g-Force COMP-2 A/S PLUS25.63″ +0.01″
- BFGoodrich g-Force Phenom T/A25.63″ +0.01″
- Michelin Pilot Alpin PA425.63″ +0.01″
- Michelin X-Ice Snow25.63″ +0.01″
- Toyo Celsius II25.63″ +0.01″
- Toyo Proxes Sport A/S25.63″ +0.01″
- General G-MAX AS0725.60″ −0.02″
- Michelin Pilot Sport 525.60″ −0.02″
Published revs per mile (811–812) mean the tire rolls like a 24.8–24.9″ tire on the vehicle. Use this for speedometer calibration.
The lightest (Michelin Pilot Sport 5, XL) is 4.0 lb lighter per corner than the heaviest (BFGoodrich g-Force COMP-2 A/S PLUS, XL).
9 tires in 215/45R18
Sort by the spec you care about.
| Load | Revs/mi | Source | |||||
|---|---|---|---|---|---|---|---|
| Michelin Pilot Sport 5Performance | XL · 93(Y) | 25.60 | 20.1 | 9.0 | 1,433 | 812 | Spec page |
| Michelin Pilot Alpin PA4Winter | XL · 93V | 25.63 | 21.6 | 10.5 | 1,433 | 812 | Spec page |
| Michelin Pilot Sport All-Season 4Performance | XL · 93Y | 25.90 | 22.2 | 10.0 | 1,433 | 812 | Spec page |
| Toyo Celsius IITouring | XL · 93V | 25.63 | 22.4 | 11.0 | 1,433 | 811 | Spec page |
| General G-MAX AS07Performance | XL · 93W | 25.60 | 22.5 | 10.0 | 1,433 | 811 | Spec page |
| Toyo Proxes Sport A/SPerformance | XL · 93W | 25.63 | 23.1 | 9.6 | 1,433 | 811 | Spec page |
| Michelin X-Ice SnowWinter | XL · 93H | 25.63 | 23.4 | 10.5 | 1,433 | 812 | Spec page |
| BFGoodrich g-Force Phenom T/APerformance | XL · 93W | 25.63 | 23.9 | 9.0 | 1,433 | 812 | Spec page |
| BFGoodrich g-Force COMP-2 A/S PLUSPerformance | XL · 93W | 25.63 | 24.1 | 9.0 | 1,433 | 812 | Spec page |
Is 215/45R18 a 26-inch tire?
Yes. The size code works out to 25.62″, and the 9 tires here publish 25.60–25.90″, so people call it a 26.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
How to read 215/45R18
A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 96.8 mm or 3.81 inches.
Radial construction.
Mounts on a 18-inch wheel. Approved wheel widths run 7.0″ to 8.0″.
Each tire carries up to 1,433 lb (650 kg) at its maximum pressure.
Rated for up to 168 mph sustained.
Printed after the size.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 25.62 | 651 mm |
| Section width | 8.46 | 215 mm |
| Sidewall height | 3.81 | 96.8 mm |
| Circumference | 80.5 | 2,044 mm |
| Revolutions per mile (calculated, unloaded) | 787.3 | 489 per km |
| Revolutions per mile (published by manufacturers) | 811–812 | 504–505 per km |
| Approved wheel width | 7.0–8.0 | 178–203 mm |
Speedometer error after switching to 215/45R18
Questions about 215/45R18
What is 215/45R18 in inches?
25.62 inches tall, 8.46 inches wide, on a 18-inch wheel. Written in inches, that is roughly 25.6×8.5R18.
How much does a 215/45R18 tire weigh?
Between 20.1 lb and 24.1 lb for the 9 tires listed here. The lightest is the Michelin Pilot Sport 5 (XL); the heaviest is the BFGoodrich g-Force COMP-2 A/S PLUS (XL).
What wheel width do I need for 215/45R18?
Manufacturers approve 7.0–8.0″ wide wheels for this size.
How many revolutions per mile does a 215/45R18 make?
Published figures run 811–812 revolutions per mile. The calculated figure is 787.3, but manufacturers measure the tire under load, where it rolls on a smaller radius.
How much taller is 215/45R18 than 275/35R18?
0.04 inches taller on paper (25.62″ vs 25.58″), which raises the axle about 0.02″. Your speedometer will read about 0.2% slow.