Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 305/40-23 | 320/80-18 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 32.61 (828.2) | 38.16 (969.2) | 5.55 (141) 17% |
| Width inches (mm) | 12.01 (305) | 12.6 (320) | 0.59 (15) 4.9% |
| Circum. inches (mm) | 102.44 (2601.87) | 119.88 (3044.83) | 17.44 (442.96) 17% |
| Sidewall Height inches (mm) | 4.8 (122) | 10.08 (256) | 5.28 (134) 109.8% |
| Revolutions per mile (km) | 618.53 (384.34) | 528.55 (328.42) | -89.98 (-55.91) -14.5% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 23.4 mph (37.67 km/h) |
| 25 mph (40.23 km/h) | 29.26 mph (47.08 km/h) |
| 30 mph (48.28 km/h) | 35.11 mph (56.5 km/h) |
| 35 mph (56.33 km/h) | 40.96 mph (65.92 km/h) |
| 40 mph (64.37 km/h) | 46.81 mph (75.33 km/h) |
| 45 mph (72.42 km/h) | 52.66 mph (84.75 km/h) |
| 50 mph (80.47 km/h) | 58.51 mph (94.17 km/h) |
| 55 mph (88.51 km/h) | 64.36 mph (103.58 km/h) |
| 60 mph (96.56 km/h) | 70.21 mph (113 km/h) |
| 65 mph (104.61 km/h) | 76.07 mph (122.42 km/h) |
| 70 mph (112.65 km/h) | 81.92 mph (131.83 km/h) |
| 75 mph (120.7 km/h) | 87.77 mph (141.25 km/h) |
| 80 mph (128.75 km/h) | 93.62 mph (150.67 km/h) |
| 85 mph (136.79 km/h) | 99.47 mph (160.08 km/h) |
| 90 mph (144.84 km/h) | 105.32 mph (169.5 km/h) |
| 95 mph (152.89 km/h) | 111.17 mph (178.92 km/h) |
| 100 mph (160.93 km/h) | 117.02 mph (188.33 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1345 | 1563 | 1683 | 1757 | 1837 | 1895 | 1957 | 2032 | 2135 | 2238 | 2352 | 2444 | 2610 | 2793 | 2936 | 3028 | 3079 | 3268 | 3531 | 4104 |
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