tireheight.com245/55R18 in inches
A 245/55R18 tire is 28.6″ tall and 9.6″ wide, and fits a 18″ wheel. In inches it is written 28.6×9.6R18.
How tall 245/55R18 tires really are
Heights published by BFGoodrich, General, Michelin and Toyo for all 12 tires in this size. Their published revolutions per mile work out to 27.7–27.8″ under load (below).
Real 245/55R18 tires measure 28.60–28.62″, against 28.61″ from the size code. They run both taller and shorter than the size code.
Published revs per mile (726–727) mean the tire rolls like a 27.7–27.8″ tire on the vehicle. Use this for speedometer calibration.
The lightest (General AltiMAX365 AW, SL) is 6.1 lb lighter per corner than the heaviest (BFGoodrich Elite-Force T/A, XL).
12 tires in 245/55R18
Sort by the spec you care about.
| Load | Revs/mi | Source | |||||
|---|---|---|---|---|---|---|---|
| General AltiMAX365 AWTouring | SL · 103V | 28.60 | 26.4 | 11.0 | 1,929 | 726 | Spec page |
| Toyo CelsiusAll-weather | SL · 103W | 28.62 | 28.7 | 9.9 | 1,929 | 726 | Spec page |
| General AltiMAX RT45Touring | SL · 103T | 28.60 | 28.7 | 11.0 | 1,929 | 726 | Spec page |
| Michelin CrossClimate2All-season | SL · 103V | 28.60 | 29.0 | 10.0 | 1,929 | 727 | Spec page |
| General G-MAX AS07Performance | SL · 103W | 28.60 | 29.5 | 10.0 | 1,929 | 726 | Spec page |
| General G-MAX JusticePerformance | SL · 103V | 28.60 | 29.5 | 10.0 | 1,929 | 726 | Spec page |
| General G-MAX Justice AWAll-weather | SL · 103V | 28.60 | 29.6 | 11.0 | 1,929 | 726 | Spec page |
| Toyo Celsius SportPerformance | SL · 103W | 28.62 | 30.8 | 10.2 | 1,929 | 726 | Spec page |
| Toyo Extensa HP IIPerformance | SL · 103V | 28.62 | 30.9 | 9.6 | 1,929 | 726 | Spec page |
| BFGoodrich Advantage ControlAll-season | SL · 103V | 28.62 | 31.3 | 10.5 | 1,929 | 727 | Spec page |
| Toyo Celsius IITouring | SL · 103W | 28.62 | 32.3 | 10.8 | 1,929 | 726 | Spec page |
| BFGoodrich Elite-Force T/AAll-season | XL · 107V | 28.62 | 32.5 | 10.5 | 2,149 | 727 | Spec page |
Is 245/55R18 a 29-inch tire?
Close. The size code works out to 28.61″, and the 12 tires here publish 28.60–28.62″, so people call it a 29.
All 29-inch tire sizes, on every wheel size.
Compare with nearby sizes
Differences in overall diameter, calculated from each size code.
How to read 245/55R18
A percentage, not a measurement: the sidewall is 55% as tall as the tire is wide, which is 134.8 mm or 5.31 inches.
Radial construction.
Mounts on a 18-inch wheel. Approved wheel widths run 7.0″ to 8.5″.
Each tire carries up to 1,929 lb (875 kg) at its maximum pressure.
Rated for up to 149 mph sustained.
| Specification | Inches | Metric |
|---|---|---|
| Overall diameter | 28.61 | 727 mm |
| Section width | 9.65 | 245 mm |
| Sidewall height | 5.31 | 134.8 mm |
| Circumference | 89.9 | 2,283 mm |
| Revolutions per mile (calculated, unloaded) | 704.9 | 438 per km |
| Revolutions per mile (published by manufacturers) | 726–727 | 451–452 per km |
| Approved wheel width | 7.0–8.5 | 178–216 mm |
Speedometer error after switching to 245/55R18
Questions about 245/55R18
What is 245/55R18 in inches?
28.61 inches tall, 9.65 inches wide, on a 18-inch wheel. Written in inches, that is roughly 28.6×9.6R18.
How much does a 245/55R18 tire weigh?
Between 26.4 lb and 32.5 lb for the 12 tires listed here. The lightest is the General AltiMAX365 AW (SL); the heaviest is the BFGoodrich Elite-Force T/A (XL).
What wheel width do I need for 245/55R18?
Manufacturers approve 7.0–8.5″ wide wheels for this size.
How many revolutions per mile does a 245/55R18 make?
Published figures run 726–727 revolutions per mile. The calculated figure is 704.9, but manufacturers measure the tire under load, where it rolls on a smaller radius.
How much taller is 245/55R18 than 295/45R18?
0.16 inches taller on paper (28.61″ vs 28.45″), which raises the axle about 0.08″. Your speedometer will read about 0.6% slow.