42x15.00R16.5 tire size
42x15.00R16.5 is a flotation (inch) size: 42.0" tall, 15.0" wide, on a 16.5" rim — about a 380/85R16.5. The sidewall is 12.8" and the tire turns 480 times per mile.
42x15.00R16.5 specs
| Overall diameter (height) | 42.00" · 1067 mm |
|---|---|
| Section width | 15.00" · 381 mm |
| Sidewall height | 12.75" · 324 mm (85% of width) |
| Rim diameter | 16.5" |
| Circumference | 131.95" · 3.351 m |
| Revolutions per mile | 480 (298 per km) |
| Closest metric size | 380/85R16.5 |
Equivalent sizes on a 16.5" 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 | |
|---|---|---|---|---|---|
| 42x14.00R16.5 | 42.00" | 0.00% | -25 mm | 60.0 mph | calculate → |
| 42.5x13.50R16.5 | 42.50" | +1.19% | -38 mm | 60.7 mph | calculate → |
| 43x14.50R16.5 | 43.00" | +2.38% | -13 mm | 61.4 mph | calculate → |
Try another size against 42x15.00R16.5
Questions
What size is 42x15.00R16.5 in inches?
42x15.00R16.5 is about 42.0" tall and 15.0" wide on a 16.5-inch rim — roughly a 380/85R16.5 in inch sizing.
What does 42x15.00R16.5 mean?
42" overall diameter, 15.00" section width, radial, 16.5" rim.
What tire sizes are equivalent to 42x15.00R16.5?
On the same 16.5" rim, within 3% of the diameter: 42x14.00R16.5 (0.00%), 42.5x13.50R16.5 (+1.19%), 43x14.50R16.5 (+2.38%).
How many revolutions per mile does a 42x15.00R16.5 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.