Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 315/35-21 | 315/25-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.68 (753.9) | 26.2 (665.5) | -3.48 (-88.4) -11.7% |
| Width inches (mm) | 12.4 (315) | 12.4 (315) | 0 (0) 0% |
| Circum. inches (mm) | 93.25 (2368.45) | 82.31 (2090.73) | -10.93 (-277.72) -11.7% |
| Sidewall Height inches (mm) | 4.34 (110.25) | 3.1 (78.75) | -1.24 (-31.5) -28.6% |
| Revolutions per mile (km) | 679.49 (422.22) | 769.75 (478.3) | 90.26 (56.08) 13.3% |
315/25-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 17.65 mph (28.41 km/h) |
| 25 mph (40.23 km/h) | 22.07 mph (35.52 km/h) |
| 30 mph (48.28 km/h) | 26.48 mph (42.62 km/h) |
| 35 mph (56.33 km/h) | 30.9 mph (49.72 km/h) |
| 40 mph (64.37 km/h) | 35.31 mph (56.83 km/h) |
| 45 mph (72.42 km/h) | 39.72 mph (63.93 km/h) |
| 50 mph (80.47 km/h) | 44.14 mph (71.03 km/h) |
| 55 mph (88.51 km/h) | 48.55 mph (78.14 km/h) |
| 60 mph (96.56 km/h) | 52.96 mph (85.24 km/h) |
| 65 mph (104.61 km/h) | 57.38 mph (92.34 km/h) |
| 70 mph (112.65 km/h) | 61.79 mph (99.44 km/h) |
| 75 mph (120.7 km/h) | 66.21 mph (106.55 km/h) |
| 80 mph (128.75 km/h) | 70.62 mph (113.65 km/h) |
| 85 mph (136.79 km/h) | 75.03 mph (120.75 km/h) |
| 90 mph (144.84 km/h) | 79.45 mph (127.86 km/h) |
| 95 mph (152.89 km/h) | 83.86 mph (134.96 km/h) |
| 100 mph (160.93 km/h) | 88.27 mph (142.06 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1959 | 2276 | 2451 | 2559 | 2676 | 2759 | 2851 | 2959 | 3109 | 3259 | 3426 | 3559 | 3801 | 4068 | 4276 | 4410 | 4485 | 4760 | 5143 | 5977 |
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