Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
185/80r15 vs 195/65r15 Tire Comparison Side By Side
  185/80-15 195/65-15 Difference
Diameter inches (mm) 26.65 (677) 24.98 (634.5) -1.67 (-42.5) -6.3%
Width inches (mm) 7.28 (185) 7.68 (195) 0.39 (10) 5.4%
Circum. inches (mm) 83.73 (2126.86) 78.48 (1993.34) -5.26 (-133.52) -6.3%
Sidewall Height inches (mm) 5.83 (148) 4.99 (126.75) -0.84 (-21.25) -14.4%
Revolutions per mile (km) 756.68 (470.18) 807.36 (501.67) 50.68 (31.49) 6.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.74 mph (30.17 km/h)
25 mph (40.23 km/h)23.43 mph (37.71 km/h)
30 mph (48.28 km/h)28.12 mph (45.25 km/h)
35 mph (56.33 km/h)32.8 mph (52.79 km/h)
40 mph (64.37 km/h)37.49 mph (60.33 km/h)
45 mph (72.42 km/h)42.18 mph (67.87 km/h)
50 mph (80.47 km/h)46.86 mph (75.42 km/h)
55 mph (88.51 km/h)51.55 mph (82.96 km/h)
60 mph (96.56 km/h)56.23 mph (90.5 km/h)
65 mph (104.61 km/h)60.92 mph (98.04 km/h)
70 mph (112.65 km/h)65.61 mph (105.58 km/h)
75 mph (120.7 km/h)70.29 mph (113.12 km/h)
80 mph (128.75 km/h)74.98 mph (120.67 km/h)
85 mph (136.79 km/h)79.66 mph (128.21 km/h)
90 mph (144.84 km/h)84.35 mph (135.75 km/h)
95 mph (152.89 km/h)89.04 mph (143.29 km/h)
100 mph (160.93 km/h)93.72 mph (150.83 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
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