Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 170/80-16 | 185/85-16 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 26.71 (678.4) | 28.38 (720.9) | 1.67 (42.5) 6.3% |
| Width inches (mm) | 6.69 (170) | 7.28 (185) | 0.59 (15) 8.8% |
| Circum. inches (mm) | 83.91 (2131.26) | 89.16 (2264.77) | 5.26 (133.52) 6.3% |
| Sidewall Height inches (mm) | 5.35 (136) | 6.19 (157.25) | 0.84 (21.25) 15.6% |
| Revolutions per mile (km) | 755.12 (469.21) | 710.6 (441.54) | -44.52 (-27.66) -5.9% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 21.25 mph (34.2 km/h) |
| 25 mph (40.23 km/h) | 26.57 mph (42.75 km/h) |
| 30 mph (48.28 km/h) | 31.88 mph (51.31 km/h) |
| 35 mph (56.33 km/h) | 37.19 mph (59.86 km/h) |
| 40 mph (64.37 km/h) | 42.51 mph (68.41 km/h) |
| 45 mph (72.42 km/h) | 47.82 mph (76.96 km/h) |
| 50 mph (80.47 km/h) | 53.13 mph (85.51 km/h) |
| 55 mph (88.51 km/h) | 58.45 mph (94.06 km/h) |
| 60 mph (96.56 km/h) | 63.76 mph (102.61 km/h) |
| 65 mph (104.61 km/h) | 69.07 mph (111.16 km/h) |
| 70 mph (112.65 km/h) | 74.39 mph (119.71 km/h) |
| 75 mph (120.7 km/h) | 79.7 mph (128.26 km/h) |
| 80 mph (128.75 km/h) | 85.01 mph (136.81 km/h) |
| 85 mph (136.79 km/h) | 90.33 mph (145.36 km/h) |
| 90 mph (144.84 km/h) | 95.64 mph (153.92 km/h) |
| 95 mph (152.89 km/h) | 100.95 mph (162.47 km/h) |
| 100 mph (160.93 km/h) | 106.26 mph (171.02 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1808 | 2101 | 2262 | 2362 | 2470 | 2547 | 2632 | 2732 | 2870 | 3009 | 3163 | 3286 | 3509 | 3755 | 3948 | 4071 | 4140 | 4394 | 4748 | 5517 |
Better Fuel Economy Factory Ratios Increased Power
