35x12.50R18 tire size
35x12.50R18 is a flotation (inch) size: 35.0" tall, 12.5" wide, on a 18" rim — about a 320/65R18. The sidewall is 8.5" and the tire turns 576 times per mile.
35x12.50R18 specs
| Overall diameter (height) | 35.00" · 889 mm |
|---|---|
| Section width | 12.50" · 318 mm |
| Sidewall height | 8.50" · 216 mm (68% of width) |
| Rim diameter | 18" |
| Circumference | 109.96" · 2.793 m |
| Revolutions per mile | 576 (358 per km) |
| Closest metric size | 320/65R18 |
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 | |
|---|---|---|---|---|---|
| 295/70R18 common | 34.26" | -2.11% | -23 mm | 58.7 mph | compare → |
| 285/75R18 | 34.83" | -0.48% | -33 mm | 59.7 mph | compare → |
| 325/65R18 | 34.63" | -1.05% | +7 mm | 59.4 mph | compare → |
| 305/70R18 | 34.81" | -0.54% | -13 mm | 59.7 mph | compare → |
| 305/65R18 | 33.61" | -3.97% | -13 mm | 57.6 mph | compare → |
| 285/70R18 | 33.71" | -3.69% | -33 mm | 57.8 mph | compare → |
| 325/60R18 | 33.35" | -4.70% | +7 mm | 57.2 mph | compare → |
| 35x11.50R18 | 35.00" | 0.00% | -26 mm | 60.0 mph | calculate → |
| 315/70R18 | 35.36" | +1.03% | -3 mm | 60.6 mph | calculate → |
| 35x13.00R18 | 35.00" | 0.00% | +12 mm | 60.0 mph | calculate → |
| 35x14.50R18 | 35.00" | 0.00% | +50 mm | 60.0 mph | calculate → |
| 34x12.50R18 | 34.00" | -2.86% | 0 mm | 58.3 mph | calculate → |
| 36x13.50R18 | 36.00" | +2.86% | +25 mm | 61.7 mph | calculate → |
| 35x13.50R18 | 35.00" | 0.00% | +25 mm | 60.0 mph | calculate → |
| 355/65R18 | 36.17" | +3.34% | +37 mm | 62.0 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 | |
|---|---|---|---|---|---|
| 35x12.50R17 common | 35.00" | 0.00% | 0 mm | 60.0 mph | compare → |
| 35x11.50R17 | 35.00" | 0.00% | -26 mm | 60.0 mph | calculate → |
| 35x14.50R17 | 35.00" | 0.00% | +50 mm | 60.0 mph | calculate → |
| 35x13.50R17 | 35.00" | 0.00% | +25 mm | 60.0 mph | calculate → |
| 35x10.50R17 | 35.00" | 0.00% | -51 mm | 60.0 mph | calculate → |
| 325/70R17 | 34.91" | -0.25% | +7 mm | 59.9 mph | calculate → |
Try another size against 35x12.50R18
Questions
What size is 35x12.50R18 in inches?
35x12.50R18 is about 35.0" tall and 12.5" wide on a 18-inch rim — roughly a 320/65R18 in inch sizing.
What does 35x12.50R18 mean?
35" overall diameter, 12.50" section width, radial, 18" rim.
What tire sizes are equivalent to 35x12.50R18?
On the same 18" rim, within 3% of the diameter: 35x11.50R18 (0.00%), 35x13.50R18 (0.00%), 35x13.00R18 (0.00%), 35x14.50R18 (0.00%), 285/75R18 (-0.48%), 305/70R18 (-0.54%).
How many revolutions per mile does a 35x12.50R18 tire make?
About 576 revolutions per mile (circumference 110.0").
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.