40x15.50R26 tire size
40x15.50R26 is a flotation (inch) size: 40.0" tall, 15.5" wide, on a 26" rim — about a 390/45R26. The sidewall is 7.0" and the tire turns 504 times per mile.
40x15.50R26 specs
| Overall diameter (height) | 40.00" · 1016 mm |
|---|---|
| Section width | 15.50" · 394 mm |
| Sidewall height | 7.00" · 178 mm (45% of width) |
| Rim diameter | 26" |
| Circumference | 125.66" · 3.192 m |
| Revolutions per mile | 504 (313 per km) |
| Closest metric size | 390/45R26 |
Equivalent sizes on a 26" 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 | |
|---|---|---|---|---|---|
| 40x13.50R26 | 40.00" | 0.00% | -51 mm | 60.0 mph | calculate → |
Try another size against 40x15.50R26
Questions
What size is 40x15.50R26 in inches?
40x15.50R26 is about 40.0" tall and 15.5" wide on a 26-inch rim — roughly a 390/45R26 in inch sizing.
What does 40x15.50R26 mean?
40" overall diameter, 15.50" section width, radial, 26" rim.
What tire sizes are equivalent to 40x15.50R26?
On the same 26" rim, within 3% of the diameter: 40x13.50R26 (0.00%).
How many revolutions per mile does a 40x15.50R26 tire make?
About 504 revolutions per mile (circumference 125.7").
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.