Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 355/25-21 | 315/30-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.99 (710.9) | 27.44 (697) | -0.55 (-13.9) -2% |
| Width inches (mm) | 13.98 (355) | 12.4 (315) | -1.57 (-40) -11.3% |
| Circum. inches (mm) | 87.93 (2233.36) | 86.21 (2189.69) | -1.72 (-43.67) -2% |
| Sidewall Height inches (mm) | 3.49 (88.75) | 3.72 (94.5) | 0.23 (5.75) 6.5% |
| Revolutions per mile (km) | 720.59 (447.76) | 734.96 (456.68) | 14.37 (8.93) 2% |
315/30-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.61 mph (31.56 km/h) |
| 25 mph (40.23 km/h) | 24.51 mph (39.45 km/h) |
| 30 mph (48.28 km/h) | 29.41 mph (47.34 km/h) |
| 35 mph (56.33 km/h) | 34.32 mph (55.23 km/h) |
| 40 mph (64.37 km/h) | 39.22 mph (63.12 km/h) |
| 45 mph (72.42 km/h) | 44.12 mph (71 km/h) |
| 50 mph (80.47 km/h) | 49.02 mph (78.89 km/h) |
| 55 mph (88.51 km/h) | 53.92 mph (86.78 km/h) |
| 60 mph (96.56 km/h) | 58.83 mph (94.67 km/h) |
| 65 mph (104.61 km/h) | 63.73 mph (102.56 km/h) |
| 70 mph (112.65 km/h) | 68.63 mph (110.45 km/h) |
| 75 mph (120.7 km/h) | 73.53 mph (118.34 km/h) |
| 80 mph (128.75 km/h) | 78.44 mph (126.23 km/h) |
| 85 mph (136.79 km/h) | 83.34 mph (134.12 km/h) |
| 90 mph (144.84 km/h) | 88.24 mph (142.01 km/h) |
| 95 mph (152.89 km/h) | 93.14 mph (149.9 km/h) |
| 100 mph (160.93 km/h) | 98.04 mph (157.79 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1870 | 2173 | 2340 | 2443 | 2555 | 2634 | 2722 | 2825 | 2969 | 3112 | 3271 | 3398 | 3629 | 3884 | 4083 | 4210 | 4282 | 4545 | 4911 | 5707 |
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