42x15.00R15 tire size
42x15.00R15 is a flotation (inch) size: 42.0" tall, 15.0" wide, on a 15" rim — about a 380/90R15. The sidewall is 13.5" and the tire turns 480 times per mile.
42x15.00R15 specs
| Overall diameter (height) | 42.00" · 1067 mm |
|---|---|
| Section width | 15.00" · 381 mm |
| Sidewall height | 13.50" · 343 mm (90% of width) |
| Rim diameter | 15" |
| Circumference | 131.95" · 3.351 m |
| Revolutions per mile | 480 (298 per km) |
| Closest metric size | 380/90R15 |
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 | |
|---|---|---|---|---|---|
| 42x14.00R15 | 42.00" | 0.00% | -25 mm | 60.0 mph | calculate → |
| 42.5x13.50R15 | 42.50" | +1.19% | -38 mm | 60.7 mph | calculate → |
| 40x16.00R15 | 40.00" | -4.76% | +25 mm | 57.1 mph | calculate → |
| 44x18.50R15 | 44.00" | +4.76% | +89 mm | 62.9 mph | calculate → |
| 44x19.50R15 | 44.00" | +4.76% | +114 mm | 62.9 mph | calculate → |
| 44x21.00R15 | 44.00" | +4.76% | +152 mm | 62.9 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 | |
|---|---|---|---|---|---|
| 42x14.00R16 | 42.00" | 0.00% | -25 mm | 60.0 mph | calculate → |
| 42x15.00R16 | 42.00" | 0.00% | 0 mm | 60.0 mph | calculate → |
Try another size against 42x15.00R15
Questions
What size is 42x15.00R15 in inches?
42x15.00R15 is about 42.0" tall and 15.0" wide on a 15-inch rim — roughly a 380/90R15 in inch sizing.
What does 42x15.00R15 mean?
42" overall diameter, 15.00" section width, radial, 15" rim.
What tire sizes are equivalent to 42x15.00R15?
On the same 15" rim, within 3% of the diameter: 42x14.00R15 (0.00%), 42.5x13.50R15 (+1.19%), 40x16.00R15 (-4.76%), 44x18.50R15 (+4.76%), 44x19.50R15 (+4.76%), 44x21.00R15 (+4.76%).
How many revolutions per mile does a 42x15.00R15 tire make?
About 480 revolutions per mile (circumference 131.9").
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.