Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 175/90-18 | 33/15.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.4 (772.2) | 32.89 (835.44) | 2.49 (63.24) 8.2% |
| Width inches (mm) | 6.89 (175) | 15.51 (394) | 8.62 (219) 125.1% |
| Circum. inches (mm) | 95.51 (2425.94) | 103.33 (2624.61) | 7.82 (198.67) 8.2% |
| Sidewall Height inches (mm) | 6.2 (157.5) | 7.45 (189.12) | 1.24 (31.62) 20.1% |
| Revolutions per mile (km) | 663.39 (412.21) | 613.17 (381.01) | -50.22 (-31.2) -7.6% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.64 mph (34.82 km/h) |
| 25 mph (40.23 km/h) | 27.05 mph (43.53 km/h) |
| 30 mph (48.28 km/h) | 32.46 mph (52.23 km/h) |
| 35 mph (56.33 km/h) | 37.87 mph (60.94 km/h) |
| 40 mph (64.37 km/h) | 43.28 mph (69.65 km/h) |
| 45 mph (72.42 km/h) | 48.69 mph (78.35 km/h) |
| 50 mph (80.47 km/h) | 54.09 mph (87.06 km/h) |
| 55 mph (88.51 km/h) | 59.5 mph (95.76 km/h) |
| 60 mph (96.56 km/h) | 64.91 mph (104.47 km/h) |
| 65 mph (104.61 km/h) | 70.32 mph (113.17 km/h) |
| 70 mph (112.65 km/h) | 75.73 mph (121.88 km/h) |
| 75 mph (120.7 km/h) | 81.14 mph (130.59 km/h) |
| 80 mph (128.75 km/h) | 86.55 mph (139.29 km/h) |
| 85 mph (136.79 km/h) | 91.96 mph (148 km/h) |
| 90 mph (144.84 km/h) | 97.37 mph (156.7 km/h) |
| 95 mph (152.89 km/h) | 102.78 mph (165.41 km/h) |
| 100 mph (160.93 km/h) | 108.19 mph (174.11 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1560 | 1813 | 1952 | 2038 | 2131 | 2198 | 2271 | 2357 | 2477 | 2596 | 2729 | 2835 | 3028 | 3240 | 3406 | 3513 | 3572 | 3791 | 4097 | 4761 |
Better Fuel Economy Factory Ratios Increased Power
