36x13.50R18 tire size
36x13.50R18 is a flotation (inch) size: 36.0" tall, 13.5" wide, on a 18" rim — about a 340/65R18. The sidewall is 9.0" and the tire turns 560 times per mile.
36x13.50R18 specs
| Overall diameter (height) | 36.00" · 914 mm |
|---|---|
| Section width | 13.50" · 343 mm |
| Sidewall height | 9.00" · 229 mm (67% of width) |
| Rim diameter | 18" |
| Circumference | 113.10" · 2.873 m |
| Revolutions per mile | 560 (348 per km) |
| Closest metric size | 340/65R18 |
Equivalent sizes on a 18" rim
Sizes within ±5% of the overall diameter. Green rows are inside the usual ±3% limit for keeping the speedometer, ABS and gearing right; red rows are bigger changes that need clearance checks.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 35x12.50R18 common | 35.00" | -2.78% | -25 mm | 58.3 mph | calculate → |
| 295/70R18 common | 34.26" | -4.83% | -48 mm | 57.1 mph | calculate → |
| 285/75R18 | 34.83" | -3.25% | -58 mm | 58.1 mph | calculate → |
| 325/65R18 | 34.63" | -3.79% | -18 mm | 57.7 mph | calculate → |
| 305/70R18 | 34.81" | -3.30% | -38 mm | 58.0 mph | calculate → |
| 37x13.50R18 | 37.00" | +2.78% | 0 mm | 61.7 mph | calculate → |
| 37x12.50R18 | 37.00" | +2.78% | -25 mm | 61.7 mph | calculate → |
| 35x11.50R18 | 35.00" | -2.78% | -51 mm | 58.3 mph | calculate → |
| 315/70R18 | 35.36" | -1.77% | -28 mm | 58.9 mph | calculate → |
| 35x13.00R18 | 35.00" | -2.78% | -13 mm | 58.3 mph | calculate → |
| 35x14.50R18 | 35.00" | -2.78% | +25 mm | 58.3 mph | calculate → |
| 37x11.50R18 | 37.00" | +2.78% | -51 mm | 61.7 mph | calculate → |
| 355/65R18 | 36.17" | +0.47% | +12 mm | 60.3 mph | calculate → |
| 35x13.50R18 | 35.00" | -2.78% | 0 mm | 58.3 mph | calculate → |
| 37x14.50R18 | 37.00" | +2.78% | +25 mm | 61.7 mph | calculate → |
Plus / minus sizing: 17" and 19" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 36x13.50R17 | 36.00" | 0.00% | 0 mm | 60.0 mph | calculate → |
| 36x12.50R17 | 36.00" | 0.00% | -25 mm | 60.0 mph | calculate → |
Try another size against 36x13.50R18
Questions
What size is 36x13.50R18 in inches?
36x13.50R18 is about 36.0" tall and 13.5" wide on a 18-inch rim — roughly a 340/65R18 in inch sizing.
What does 36x13.50R18 mean?
36" overall diameter, 13.50" section width, radial, 18" rim.
What tire sizes are equivalent to 36x13.50R18?
On the same 18" rim, within 3% of the diameter: 355/65R18 (+0.47%), 315/70R18 (-1.77%), 35x11.50R18 (-2.78%), 35x12.50R18 (-2.78%), 35x13.50R18 (-2.78%), 35x13.00R18 (-2.78%).
How many revolutions per mile does a 36x13.50R18 tire make?
About 560 revolutions per mile (circumference 113.1").
How these numbers are computed
Diameter = rim + 2 × sidewall, sidewall = width × aspect ÷ 100, circumference = π × diameter, revolutions per mile = 63,360 ÷ circumference. Real tires differ by brand by a few tenths of an inch. Last reviewed October 14, 2026.