Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/80r15 vs 195/85r15 Tire Comparison Side By Side
  205/80-15 195/85-15 Difference
Diameter inches (mm) 27.91 (709) 28.05 (712.5) 0.14 (3.5) 0.5%
Width inches (mm) 8.07 (205) 7.68 (195) -0.39 (-10) -4.9%
Circum. inches (mm) 87.69 (2227.39) 88.13 (2238.38) 0.43 (11) 0.5%
Sidewall Height inches (mm) 6.46 (164) 6.53 (165.75) 0.07 (1.75) 1.1%
Revolutions per mile (km) 722.52 (448.96) 718.98 (446.75) -3.55 (-2.21) -0.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.1 mph (32.35 km/h)
25 mph (40.23 km/h)25.12 mph (40.43 km/h)
30 mph (48.28 km/h)30.15 mph (48.52 km/h)
35 mph (56.33 km/h)35.17 mph (56.61 km/h)
40 mph (64.37 km/h)40.2 mph (64.69 km/h)
45 mph (72.42 km/h)45.22 mph (72.78 km/h)
50 mph (80.47 km/h)50.25 mph (80.86 km/h)
55 mph (88.51 km/h)55.27 mph (88.95 km/h)
60 mph (96.56 km/h)60.3 mph (97.04 km/h)
65 mph (104.61 km/h)65.32 mph (105.12 km/h)
70 mph (112.65 km/h)70.35 mph (113.21 km/h)
75 mph (120.7 km/h)75.37 mph (121.3 km/h)
80 mph (128.75 km/h)80.39 mph (129.38 km/h)
85 mph (136.79 km/h)85.42 mph (137.47 km/h)
90 mph (144.84 km/h)90.44 mph (145.56 km/h)
95 mph (152.89 km/h)95.47 mph (153.64 km/h)
100 mph (160.93 km/h)100.49 mph (161.73 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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