Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/80r15 vs 195/65r15 Tire Comparison Side By Side
  155/80-15 195/65-15 Difference
Diameter inches (mm) 24.76 (629) 24.98 (634.5) 0.22 (5.5) 0.9%
Width inches (mm) 6.1 (155) 7.68 (195) 1.57 (40) 25.8%
Circum. inches (mm) 77.8 (1976.06) 78.48 (1993.34) 0.68 (17.28) 0.9%
Sidewall Height inches (mm) 4.88 (124) 4.99 (126.75) 0.11 (2.75) 2.2%
Revolutions per mile (km) 814.42 (506.06) 807.36 (501.67) -7.06 (-4.39) -0.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.17 mph (32.47 km/h)
25 mph (40.23 km/h)25.22 mph (40.59 km/h)
30 mph (48.28 km/h)30.26 mph (48.7 km/h)
35 mph (56.33 km/h)35.31 mph (56.82 km/h)
40 mph (64.37 km/h)40.35 mph (64.94 km/h)
45 mph (72.42 km/h)45.39 mph (73.05 km/h)
50 mph (80.47 km/h)50.44 mph (81.17 km/h)
55 mph (88.51 km/h)55.48 mph (89.29 km/h)
60 mph (96.56 km/h)60.52 mph (97.41 km/h)
65 mph (104.61 km/h)65.57 mph (105.52 km/h)
70 mph (112.65 km/h)70.61 mph (113.64 km/h)
75 mph (120.7 km/h)75.66 mph (121.76 km/h)
80 mph (128.75 km/h)80.7 mph (129.87 km/h)
85 mph (136.79 km/h)85.74 mph (137.99 km/h)
90 mph (144.84 km/h)90.79 mph (146.11 km/h)
95 mph (152.89 km/h)95.83 mph (154.22 km/h)
100 mph (160.93 km/h)100.87 mph (162.34 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
20552387257026842806289429903104326134183593373339874267448546254704499253946269
Better Fuel Economy Factory Ratios Increased Power

Most Popular 155/80-R15 Comparisons

To Top