44x21.00R15 tire size
44x21.00R15 is a flotation (inch) size: 44.0" tall, 21.0" wide, on a 15" rim — about a 530/70R15. The sidewall is 14.5" and the tire turns 458 times per mile.
44x21.00R15 specs
| Overall diameter (height) | 44.00" · 1118 mm |
|---|---|
| Section width | 21.00" · 533 mm |
| Sidewall height | 14.50" · 368 mm (69% of width) |
| Rim diameter | 15" |
| Circumference | 138.23" · 3.511 m |
| Revolutions per mile | 458 (285 per km) |
| Closest metric size | 530/70R15 |
Equivalent sizes on a 15" 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 | |
|---|---|---|---|---|---|
| 42x15.00R15 | 42.00" | -4.55% | -152 mm | 57.3 mph | calculate → |
| 44x18.50R15 | 44.00" | 0.00% | -63 mm | 60.0 mph | calculate → |
| 44x19.50R15 | 44.00" | 0.00% | -38 mm | 60.0 mph | calculate → |
| 42.5x13.50R15 | 42.50" | -3.41% | -190 mm | 58.0 mph | calculate → |
| 42x14.00R15 | 42.00" | -4.55% | -177 mm | 57.3 mph | calculate → |
Plus / minus sizing: 14" and 16" rims
Same overall height on a different rim. Check wheel width and clearance before switching.
| Size | Diameter | Difference | Width | Speedo at 60 | |
|---|---|---|---|---|---|
| 44x19.50R16 | 44.00" | 0.00% | -38 mm | 60.0 mph | calculate → |
| 44x21.00R16 | 44.00" | 0.00% | 0 mm | 60.0 mph | calculate → |
Try another size against 44x21.00R15
Questions
What size is 44x21.00R15 in inches?
44x21.00R15 is about 44.0" tall and 21.0" wide on a 15-inch rim — roughly a 530/70R15 in inch sizing.
What does 44x21.00R15 mean?
44" overall diameter, 21.00" section width, radial, 15" rim.
What tire sizes are equivalent to 44x21.00R15?
On the same 15" rim, within 3% of the diameter: 44x18.50R15 (0.00%), 44x19.50R15 (0.00%), 42.5x13.50R15 (-3.41%), 42x14.00R15 (-4.55%), 42x15.00R15 (-4.55%).
How many revolutions per mile does a 44x21.00R15 tire make?
About 458 revolutions per mile (circumference 138.2").
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.