Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 245/35-21 | 235/50-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 27.75 (704.9) | 27.25 (692.2) | -0.5 (-12.7) -1.8% |
| Width inches (mm) | 9.65 (245) | 9.25 (235) | -0.39 (-10) -4.1% |
| Circum. inches (mm) | 87.19 (2214.51) | 85.61 (2174.61) | -1.57 (-39.9) -1.8% |
| Sidewall Height inches (mm) | 3.38 (85.75) | 4.63 (117.5) | 1.25 (31.75) 37% |
| Revolutions per mile (km) | 726.73 (451.57) | 740.06 (459.85) | 13.33 (8.29) 1.8% |
235/50-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.64 mph (31.61 km/h) |
| 25 mph (40.23 km/h) | 24.55 mph (39.51 km/h) |
| 30 mph (48.28 km/h) | 29.46 mph (47.41 km/h) |
| 35 mph (56.33 km/h) | 34.37 mph (55.31 km/h) |
| 40 mph (64.37 km/h) | 39.28 mph (63.21 km/h) |
| 45 mph (72.42 km/h) | 44.19 mph (71.12 km/h) |
| 50 mph (80.47 km/h) | 49.1 mph (79.02 km/h) |
| 55 mph (88.51 km/h) | 54.01 mph (86.92 km/h) |
| 60 mph (96.56 km/h) | 58.92 mph (94.82 km/h) |
| 65 mph (104.61 km/h) | 63.83 mph (102.72 km/h) |
| 70 mph (112.65 km/h) | 68.74 mph (110.62 km/h) |
| 75 mph (120.7 km/h) | 73.65 mph (118.53 km/h) |
| 80 mph (128.75 km/h) | 78.56 mph (126.43 km/h) |
| 85 mph (136.79 km/h) | 83.47 mph (134.33 km/h) |
| 90 mph (144.84 km/h) | 88.38 mph (142.23 km/h) |
| 95 mph (152.89 km/h) | 93.29 mph (150.13 km/h) |
| 100 mph (160.93 km/h) | 98.2 mph (158.04 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1883 | 2188 | 2356 | 2460 | 2573 | 2653 | 2741 | 2845 | 2989 | 3134 | 3294 | 3422 | 3654 | 3911 | 4111 | 4239 | 4312 | 4576 | 4945 | 5746 |
Better Fuel Economy Factory Ratios Increased Power
