Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
345/25r20 vs 395/25r20 Tire Comparison Side By Side
  345/25-20 395/25-20 Difference
Diameter inches (mm) 26.79 (680.5) 27.78 (705.5) 0.98 (25) 3.7%
Width inches (mm) 13.58 (345) 15.55 (395) 1.97 (50) 14.5%
Circum. inches (mm) 84.17 (2137.85) 87.26 (2216.39) 3.09 (78.54) 3.7%
Sidewall Height inches (mm) 3.4 (86.25) 3.89 (98.75) 0.49 (12.5) 14.5%
Revolutions per mile (km) 752.78 (467.76) 726.11 (451.18) -26.68 (-16.58) -3.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.73 mph (33.37 km/h)
25 mph (40.23 km/h)25.92 mph (41.71 km/h)
30 mph (48.28 km/h)31.1 mph (50.05 km/h)
35 mph (56.33 km/h)36.29 mph (58.4 km/h)
40 mph (64.37 km/h)41.47 mph (66.74 km/h)
45 mph (72.42 km/h)46.65 mph (75.08 km/h)
50 mph (80.47 km/h)51.84 mph (83.42 km/h)
55 mph (88.51 km/h)57.02 mph (91.77 km/h)
60 mph (96.56 km/h)62.2 mph (100.11 km/h)
65 mph (104.61 km/h)67.39 mph (108.45 km/h)
70 mph (112.65 km/h)72.57 mph (116.79 km/h)
75 mph (120.7 km/h)77.76 mph (125.14 km/h)
80 mph (128.75 km/h)82.94 mph (133.48 km/h)
85 mph (136.79 km/h)88.12 mph (141.82 km/h)
90 mph (144.84 km/h)93.31 mph (150.16 km/h)
95 mph (152.89 km/h)98.49 mph (158.5 km/h)
100 mph (160.93 km/h)103.67 mph (166.85 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
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
18482147231224142524260326892791293330743232335835863837403441604230449048515638
Better Fuel Economy Factory Ratios Increased Power

Most Popular 345/25-R20 Comparisons

To Top