Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 235/45-21 | 235/60-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 29.33 (744.9) | 29.1 (739.2) | -0.22 (-5.7) -0.8% |
| Width inches (mm) | 9.25 (235) | 9.25 (235) | 0 (0) 0% |
| Circum. inches (mm) | 92.13 (2340.17) | 91.43 (2322.27) | -0.71 (-17.91) -0.8% |
| Sidewall Height inches (mm) | 4.16 (105.75) | 5.55 (141) | 1.39 (35.25) 33.3% |
| Revolutions per mile (km) | 687.7 (427.32) | 693.01 (430.61) | 5.3 (3.3) 0.8% |
235/60-18 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.85 mph (31.94 km/h) |
| 25 mph (40.23 km/h) | 24.81 mph (39.93 km/h) |
| 30 mph (48.28 km/h) | 29.77 mph (47.91 km/h) |
| 35 mph (56.33 km/h) | 34.73 mph (55.9 km/h) |
| 40 mph (64.37 km/h) | 39.69 mph (63.88 km/h) |
| 45 mph (72.42 km/h) | 44.66 mph (71.87 km/h) |
| 50 mph (80.47 km/h) | 49.62 mph (79.85 km/h) |
| 55 mph (88.51 km/h) | 54.58 mph (87.84 km/h) |
| 60 mph (96.56 km/h) | 59.54 mph (95.82 km/h) |
| 65 mph (104.61 km/h) | 64.5 mph (103.81 km/h) |
| 70 mph (112.65 km/h) | 69.46 mph (111.79 km/h) |
| 75 mph (120.7 km/h) | 74.43 mph (119.78 km/h) |
| 80 mph (128.75 km/h) | 79.39 mph (127.76 km/h) |
| 85 mph (136.79 km/h) | 84.35 mph (135.75 km/h) |
| 90 mph (144.84 km/h) | 89.31 mph (143.73 km/h) |
| 95 mph (152.89 km/h) | 94.27 mph (151.72 km/h) |
| 100 mph (160.93 km/h) | 99.23 mph (159.7 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1764 | 2049 | 2206 | 2304 | 2409 | 2484 | 2567 | 2664 | 2799 | 2934 | 3084 | 3204 | 3422 | 3662 | 3850 | 3970 | 4037 | 4285 | 4630 | 5381 |
Better Fuel Economy Factory Ratios Increased Power
