Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-23 | 305/50-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.61 (828.2) | 32.01 (813) | -0.6 (-15.2) -1.8% |
| Width inches (mm) | 12.01 (305) | 12.01 (305) | 0 (0) 0% |
| Circum. inches (mm) | 102.44 (2601.87) | 100.56 (2554.11) | -1.88 (-47.75) -1.8% |
| Sidewall Height inches (mm) | 4.8 (122) | 6 (152.5) | 1.2 (30.5) 25% |
| Revolutions per mile (km) | 618.53 (384.34) | 630.1 (391.52) | 11.56 (7.19) 1.9% |
305/50-20 Tires
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 19.63 mph (31.6 km/h) |
| 25 mph (40.23 km/h) | 24.54 mph (39.5 km/h) |
| 30 mph (48.28 km/h) | 29.45 mph (47.39 km/h) |
| 35 mph (56.33 km/h) | 34.36 mph (55.29 km/h) |
| 40 mph (64.37 km/h) | 39.27 mph (63.19 km/h) |
| 45 mph (72.42 km/h) | 44.17 mph (71.09 km/h) |
| 50 mph (80.47 km/h) | 49.08 mph (78.99 km/h) |
| 55 mph (88.51 km/h) | 53.99 mph (86.89 km/h) |
| 60 mph (96.56 km/h) | 58.9 mph (94.79 km/h) |
| 65 mph (104.61 km/h) | 63.81 mph (102.69 km/h) |
| 70 mph (112.65 km/h) | 68.72 mph (110.59 km/h) |
| 75 mph (120.7 km/h) | 73.62 mph (118.49 km/h) |
| 80 mph (128.75 km/h) | 78.53 mph (126.38 km/h) |
| 85 mph (136.79 km/h) | 83.44 mph (134.28 km/h) |
| 90 mph (144.84 km/h) | 88.35 mph (142.18 km/h) |
| 95 mph (152.89 km/h) | 93.26 mph (150.08 km/h) |
| 100 mph (160.93 km/h) | 98.16 mph (157.98 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1603 | 1863 | 2006 | 2095 | 2190 | 2259 | 2334 | 2422 | 2545 | 2668 | 2804 | 2914 | 3111 | 3330 | 3500 | 3610 | 3671 | 3896 | 4210 | 4892 |
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