Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 355/25-21 | 245/45-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.99 (710.9) | 26.68 (677.7) | -1.31 (-33.2) -4.7% |
| Width inches (mm) | 13.98 (355) | 9.65 (245) | -4.33 (-110) -31% |
| Circum. inches (mm) | 87.93 (2233.36) | 83.82 (2129.06) | -4.11 (-104.3) -4.7% |
| Sidewall Height inches (mm) | 3.49 (88.75) | 4.34 (110.25) | 0.85 (21.5) 24.2% |
| Revolutions per mile (km) | 720.59 (447.76) | 755.9 (469.69) | 35.3 (21.94) 4.9% |
245/45-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.07 mph (30.68 km/h) |
| 25 mph (40.23 km/h) | 23.83 mph (38.35 km/h) |
| 30 mph (48.28 km/h) | 28.6 mph (46.03 km/h) |
| 35 mph (56.33 km/h) | 33.37 mph (53.7 km/h) |
| 40 mph (64.37 km/h) | 38.13 mph (61.37 km/h) |
| 45 mph (72.42 km/h) | 42.9 mph (69.04 km/h) |
| 50 mph (80.47 km/h) | 47.66 mph (76.71 km/h) |
| 55 mph (88.51 km/h) | 52.43 mph (84.38 km/h) |
| 60 mph (96.56 km/h) | 57.2 mph (92.05 km/h) |
| 65 mph (104.61 km/h) | 61.96 mph (99.72 km/h) |
| 70 mph (112.65 km/h) | 66.73 mph (107.39 km/h) |
| 75 mph (120.7 km/h) | 71.5 mph (115.06 km/h) |
| 80 mph (128.75 km/h) | 76.26 mph (122.74 km/h) |
| 85 mph (136.79 km/h) | 81.03 mph (130.41 km/h) |
| 90 mph (144.84 km/h) | 85.8 mph (138.08 km/h) |
| 95 mph (152.89 km/h) | 90.56 mph (145.75 km/h) |
| 100 mph (160.93 km/h) | 95.33 mph (153.42 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1924 | 2235 | 2407 | 2513 | 2628 | 2709 | 2799 | 2906 | 3053 | 3201 | 3364 | 3495 | 3733 | 3995 | 4199 | 4330 | 4404 | 4674 | 5050 | 5869 |
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