Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/25-21 | 315/30-19 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27 (685.9) | 26.44 (671.6) | -0.56 (-14.3) -2.1% |
| Width inches (mm) | 12.01 (305) | 12.4 (315) | 0.39 (10) 3.3% |
| Circum. inches (mm) | 84.84 (2154.82) | 83.07 (2109.89) | -1.77 (-44.92) -2.1% |
| Sidewall Height inches (mm) | 3 (76.25) | 3.72 (94.5) | 0.72 (18.25) 23.9% |
| Revolutions per mile (km) | 746.86 (464.08) | 762.76 (473.96) | 15.9 (9.88) 2.1% |
315/30-19 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.58 mph (31.52 km/h) |
| 25 mph (40.23 km/h) | 24.48 mph (39.39 km/h) |
| 30 mph (48.28 km/h) | 29.37 mph (47.27 km/h) |
| 35 mph (56.33 km/h) | 34.27 mph (55.15 km/h) |
| 40 mph (64.37 km/h) | 39.17 mph (63.03 km/h) |
| 45 mph (72.42 km/h) | 44.06 mph (70.91 km/h) |
| 50 mph (80.47 km/h) | 48.96 mph (78.79 km/h) |
| 55 mph (88.51 km/h) | 53.85 mph (86.67 km/h) |
| 60 mph (96.56 km/h) | 58.75 mph (94.55 km/h) |
| 65 mph (104.61 km/h) | 63.64 mph (102.43 km/h) |
| 70 mph (112.65 km/h) | 68.54 mph (110.31 km/h) |
| 75 mph (120.7 km/h) | 73.44 mph (118.18 km/h) |
| 80 mph (128.75 km/h) | 78.33 mph (126.06 km/h) |
| 85 mph (136.79 km/h) | 83.23 mph (133.94 km/h) |
| 90 mph (144.84 km/h) | 88.12 mph (141.82 km/h) |
| 95 mph (152.89 km/h) | 93.02 mph (149.7 km/h) |
| 100 mph (160.93 km/h) | 97.92 mph (157.58 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1941 | 2255 | 2428 | 2536 | 2651 | 2734 | 2825 | 2932 | 3081 | 3230 | 3395 | 3527 | 3767 | 4031 | 4237 | 4369 | 4444 | 4716 | 5096 | 5922 |
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