Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 260/65-18 | 30/12.5-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 31.31 (795.2) | 30.02 (762.48) | -1.29 (-32.72) -4.1% |
| Width inches (mm) | 10.24 (260) | 12.52 (318) | 2.28 (58) 22.3% |
| Circum. inches (mm) | 98.35 (2498.19) | 94.31 (2395.4) | -4.05 (-102.79) -4.1% |
| Sidewall Height inches (mm) | 6.65 (169) | 6.01 (152.64) | -0.64 (-16.36) -9.7% |
| Revolutions per mile (km) | 644.2 (400.29) | 671.85 (417.47) | 27.64 (17.18) 4.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.18 mph (30.86 km/h) |
| 25 mph (40.23 km/h) | 23.97 mph (38.58 km/h) |
| 30 mph (48.28 km/h) | 28.77 mph (46.29 km/h) |
| 35 mph (56.33 km/h) | 33.56 mph (54.01 km/h) |
| 40 mph (64.37 km/h) | 38.35 mph (61.73 km/h) |
| 45 mph (72.42 km/h) | 43.15 mph (69.44 km/h) |
| 50 mph (80.47 km/h) | 47.94 mph (77.16 km/h) |
| 55 mph (88.51 km/h) | 52.74 mph (84.87 km/h) |
| 60 mph (96.56 km/h) | 57.53 mph (92.59 km/h) |
| 65 mph (104.61 km/h) | 62.33 mph (100.3 km/h) |
| 70 mph (112.65 km/h) | 67.12 mph (108.02 km/h) |
| 75 mph (120.7 km/h) | 71.91 mph (115.73 km/h) |
| 80 mph (128.75 km/h) | 76.71 mph (123.45 km/h) |
| 85 mph (136.79 km/h) | 81.5 mph (131.17 km/h) |
| 90 mph (144.84 km/h) | 86.3 mph (138.88 km/h) |
| 95 mph (152.89 km/h) | 91.09 mph (146.6 km/h) |
| 100 mph (160.93 km/h) | 95.89 mph (154.31 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1710 | 1986 | 2139 | 2234 | 2335 | 2408 | 2488 | 2583 | 2714 | 2845 | 2990 | 3107 | 3318 | 3550 | 3732 | 3849 | 3914 | 4154 | 4489 | 5216 |
Better Fuel Economy Factory Ratios Increased Power
