Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 295/40-21 | 315/40-21 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 30.29 (769.4) | 30.92 (785.4) | 0.63 (16) 2.1% |
| Width inches (mm) | 11.61 (295) | 12.4 (315) | 0.79 (20) 6.8% |
| Circum. inches (mm) | 95.16 (2417.14) | 97.14 (2467.41) | 1.98 (50.27) 2.1% |
| Sidewall Height inches (mm) | 4.65 (118) | 4.96 (126) | 0.31 (8) 6.8% |
| Revolutions per mile (km) | 665.8 (413.71) | 652.24 (405.28) | -13.56 (-8.43) -2% |
315/40-21 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 20.42 mph (32.86 km/h) |
| 25 mph (40.23 km/h) | 25.52 mph (41.07 km/h) |
| 30 mph (48.28 km/h) | 30.62 mph (49.28 km/h) |
| 35 mph (56.33 km/h) | 35.73 mph (57.5 km/h) |
| 40 mph (64.37 km/h) | 40.83 mph (65.71 km/h) |
| 45 mph (72.42 km/h) | 45.94 mph (73.93 km/h) |
| 50 mph (80.47 km/h) | 51.04 mph (82.14 km/h) |
| 55 mph (88.51 km/h) | 56.14 mph (90.35 km/h) |
| 60 mph (96.56 km/h) | 61.25 mph (98.57 km/h) |
| 65 mph (104.61 km/h) | 66.35 mph (106.78 km/h) |
| 70 mph (112.65 km/h) | 71.46 mph (115 km/h) |
| 75 mph (120.7 km/h) | 76.56 mph (123.21 km/h) |
| 80 mph (128.75 km/h) | 81.66 mph (131.43 km/h) |
| 85 mph (136.79 km/h) | 86.77 mph (139.64 km/h) |
| 90 mph (144.84 km/h) | 91.87 mph (147.85 km/h) |
| 95 mph (152.89 km/h) | 96.98 mph (156.07 km/h) |
| 100 mph (160.93 km/h) | 102.08 mph (164.28 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1660 | 1928 | 2077 | 2168 | 2267 | 2338 | 2416 | 2507 | 2635 | 2762 | 2903 | 3016 | 3221 | 3447 | 3623 | 3736 | 3800 | 4033 | 4358 | 5064 |
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