Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/80r15 vs 195/65r15 Tire Comparison Side By Side
  165/80-15 195/65-15 Difference
Diameter inches (mm) 25.39 (645) 24.98 (634.5) -0.41 (-10.5) -1.6%
Width inches (mm) 6.5 (165) 7.68 (195) 1.18 (30) 18.2%
Circum. inches (mm) 79.78 (2026.33) 78.48 (1993.34) -1.3 (-32.99) -1.6%
Sidewall Height inches (mm) 5.2 (132) 4.99 (126.75) -0.21 (-5.25) -4%
Revolutions per mile (km) 794.22 (493.5) 807.36 (501.67) 13.14 (8.17) 1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.67 mph (31.66 km/h)
25 mph (40.23 km/h)24.59 mph (39.58 km/h)
30 mph (48.28 km/h)29.51 mph (47.49 km/h)
35 mph (56.33 km/h)34.43 mph (55.41 km/h)
40 mph (64.37 km/h)39.35 mph (63.33 km/h)
45 mph (72.42 km/h)44.27 mph (71.24 km/h)
50 mph (80.47 km/h)49.19 mph (79.16 km/h)
55 mph (88.51 km/h)54.1 mph (87.07 km/h)
60 mph (96.56 km/h)59.02 mph (94.99 km/h)
65 mph (104.61 km/h)63.94 mph (102.9 km/h)
70 mph (112.65 km/h)68.86 mph (110.82 km/h)
75 mph (120.7 km/h)73.78 mph (118.74 km/h)
80 mph (128.75 km/h)78.7 mph (126.65 km/h)
85 mph (136.79 km/h)83.62 mph (134.57 km/h)
90 mph (144.84 km/h)88.53 mph (142.48 km/h)
95 mph (152.89 km/h)93.45 mph (150.4 km/h)
100 mph (160.93 km/h)98.37 mph (158.31 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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