tireheight.com225/45R18 in inches
A 225/45R18 tire is 26.0″ tall and 8.9″ wide, and fits a 18″ wheel. In inches it is written 26.0×8.9R18.
How tall 225/45R18 tires really are
Heights published by BFGoodrich, General, Michelin and Toyo for all 35 tires in this size. Their published revolutions per mile work out to 25.1–25.2″ under load (below).
Real 225/45R18 tires measure 25.90–26.00″, against 25.97″ from the size code. Most run shorter than the size code (28 of 35).
Published revs per mile (800–802) mean the tire rolls like a 25.1–25.2″ tire on the vehicle. Use this for speedometer calibration.
The lightest (Michelin Pilot Sport 4, XL) is 6.0 lb lighter per corner than the heaviest (Michelin Pilot Alpin PA4, XL).
35 tires in 225/45R18
Sort by the spec you care about.
| Load | Revs/mi | Source | |||||
|---|---|---|---|---|---|---|---|
| Michelin Pilot Sport 4Performance | XL · 95Y | 25.90 | 20.7 | 9.0 | 1,521 | 802 | Spec page |
| Michelin Pilot Sport 5Performance | XL · 95Y | 25.90 | 20.8 | 9.0 | 1,521 | 802 | Spec page |
| Michelin Pilot Alpin 5Winter | XL · 95H | 25.94 | 21.2 | 9.5 | 1,521 | 802 | Spec page |
| General G-MAX RSPerformance | SL · 91Y | 26.00 | 21.3 | 10.0 | 1,356 | 800 | Spec page |
| Michelin Pilot Alpin 5Winter | XL · 95H | 25.94 | 21.4 | 9.5 | 1,521 | 802 | Spec page |
| Michelin Pilot Sport 4Performance | XL · 95W | 25.90 | 21.6 | 9.5 | 1,521 | 802 | Spec page |
| Michelin Pilot Sport 5Performance | XL · 95W | 25.90 | 21.7 | 9.0 | 1,521 | 802 | Spec page |
| Toyo Proxes Sport 2Performance | XL · 95(Y) | 25.90 | 21.9 | 9.1 | 1,521 | 801 | Spec page |
| General AltiMAX365 AWTouring | XL · 95V | 26.00 | 22.1 | 11.0 | 1,521 | 800 | Spec page |
| Michelin Pilot Sport 4Performance | XL · 95Y | 25.90 | 22.1 | 9.5 | 1,521 | 802 | Spec page |
| Michelin Pilot Sport 4 SPerformance | XL · 95(Y) | 25.90 | 22.2 | 9.5 | 1,521 | 802 | Spec page |
| Michelin Pilot Super SportPerformance | XL · 95(Y) | 25.90 | 22.3 | 9.0 | 1,521 | 802 | Spec page |
| General AltiMAX RT45Touring | XL · 95V | 26.00 | 22.4 | 11.0 | 1,521 | 800 | Spec page |
| Toyo Extensa A/S IIAll-season | XL · 95V | 25.94 | 22.7 | 10.6 | 1,521 | 801 | Spec page |
| General ReliaTrekTouring | XL · 95V | 26.00 | 22.8 | 11.0 | 1,521 | 800 | Spec page |
| Toyo Extensa HP IIPerformance | XL · 95W | 25.94 | 23.1 | 9.3 | 1,521 | 801 | Spec page |
| Toyo Celsius IITouring | XL · 95V | 25.95 | 23.3 | 11.1 | 1,521 | 801 | Spec page |
| Michelin Pilot Sport All-Season 4Performance | XL · 95Y | 26.00 | 23.6 | 10.0 | 1,521 | 800 | Spec page |
| General AltiMAX Arctic XWinter | XL · 95T | 26.00 | 23.9 | 12.0 | 1,521 | 800 | Spec page |
| Michelin X-Ice Snow+Winter | XL · 95H | 25.94 | 24.0 | 10.5 | 1,521 | 802 | Spec page |
| General G-MAX AS07Performance | XL · 95W | 26.00 | 24.2 | 10.0 | 1,521 | 800 | Spec page |
| Michelin Primacy MXM4Touring | XL · 95W | 25.90 | 24.2 | 9.0 | 1,521 | 802 | Spec page |
| Michelin X-Ice SnowWinter | XL · 95H | 25.94 | 24.2 | 10.5 | 1,521 | 802 | Spec page |
| Toyo CelsiusAll-weather | XL · 95V | 25.94 | 24.3 | 10.3 | 1,521 | 801 | Spec page |
| Toyo Proxes G-Tour | XL · 95V | 25.90 | 24.3 | 11.5 | 1,521 | 801 | Spec page |
| Toyo Observe G3-IceWinter | XL · 95T | 25.94 | 24.5 | 11.3 | 1,521 | 801 | Spec page |
| BFGoodrich Advantage ControlAll-season | XL · 95V | 25.94 | 24.5 | 10.5 | 1,521 | 802 | Spec page |
| Michelin CrossClimate2All-season | XL · 95V | 25.90 | 24.8 | 10.0 | 1,521 | 802 | Spec page |
| Toyo Proxes Sport A/SPerformance | XL · 95Y | 25.94 | 25.1 | 9.3 | 1,521 | 801 | Spec page |
| BFGoodrich g-Force COMP-2 A/S PLUSPerformance | XL · 95Y | 25.94 | 25.6 | 9.0 | 1,521 | 802 | Spec page |
| Michelin Primacy MXM4Touring | SL · 91H | 25.90 | 25.7 | 8.5 | 1,356 | 802 | Spec page |
| Michelin Pilot Sport 4Performance | XL · 95Y | 25.90 | 25.8 | 9.5 | 1,521 | 802 | Spec page |
| Michelin Primacy 3Performance | SL · 91W | 25.94 | 26.0 | 9.0 | 1,356 | 802 | Spec page |
| BFGoodrich g-Force Phenom T/APerformance | XL · 95W | 25.94 | 26.6 | 9.0 | 1,521 | 802 | Spec page |
| Michelin Pilot Alpin PA4Winter | XL · 95V | 25.94 | 26.7 | 10.5 | 1,521 | 802 | Spec page |
Is 225/45R18 a 26-inch tire?
Yes. The size code works out to 25.97″, and the 35 tires here publish 25.90–26.00″, so people call it a 26.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
How to read 225/45R18
A percentage, not a measurement: the sidewall is 45% as tall as the tire is wide, which is 101.3 mm or 3.99 inches.
Radial construction.
Mounts on a 18-inch wheel. Approved wheel widths run 7.0″ to 8.5″.
Each tire carries up to 1,521 lb (690 kg) at its maximum pressure.
Rated for up to 149 mph sustained.
Printed after the size. In this size the XL tires carry up to 1,521 lb each and the standard-load tires up to 1,356 lb, as published.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 25.97 | 660 mm |
| Section width | 8.86 | 225 mm |
| Sidewall height | 3.99 | 101.3 mm |
| Circumference | 81.6 | 2,073 mm |
| Revolutions per mile (calculated, unloaded) | 776.5 | 483 per km |
| Revolutions per mile (published by manufacturers) | 800–802 | 497–498 per km |
| Approved wheel width | 7.0–8.5 | 178–216 mm |
Speedometer error after switching to 225/45R18
Questions about 225/45R18
What is 225/45R18 in inches?
25.97 inches tall, 8.86 inches wide, on a 18-inch wheel. Written in inches, that is roughly 26.0×8.9R18.
How much does a 225/45R18 tire weigh?
Between 20.7 lb and 26.7 lb for the 35 tires listed here. The lightest is the Michelin Pilot Sport 4 (XL); the heaviest is the Michelin Pilot Alpin PA4 (XL).
What wheel width do I need for 225/45R18?
Manufacturers approve 7.0–8.5″ wide wheels for this size.
How many revolutions per mile does a 225/45R18 make?
Published figures run 800–802 revolutions per mile. The calculated figure is 776.5, but manufacturers measure the tire under load, where it rolls on a smaller radius.
How much taller is 225/45R18 than 335/30R18?
0.06 inches taller on paper (25.97″ vs 25.91″), which raises the axle about 0.03″. Your speedometer will read about 0.2% slow.