Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/70r14 vs 195/50r15 Tire Comparison Side By Side
  195/70-14 195/50-15 Difference
Diameter inches (mm) 24.75 (628.6) 22.68 (576) -2.07 (-52.6) -8.4%
Width inches (mm) 7.68 (195) 7.68 (195) 0 (0) 0%
Circum. inches (mm) 77.75 (1974.81) 71.24 (1809.56) -6.51 (-165.25) -8.4%
Sidewall Height inches (mm) 5.37 (136.5) 3.84 (97.5) -1.54 (-39) -28.6%
Revolutions per mile (km) 814.94 (506.38) 889.36 (552.62) 74.42 (46.24) 9.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.33 mph (29.49 km/h)
25 mph (40.23 km/h)22.91 mph (36.87 km/h)
30 mph (48.28 km/h)27.49 mph (44.24 km/h)
35 mph (56.33 km/h)32.07 mph (51.61 km/h)
40 mph (64.37 km/h)36.65 mph (58.99 km/h)
45 mph (72.42 km/h)41.23 mph (66.36 km/h)
50 mph (80.47 km/h)45.82 mph (73.73 km/h)
55 mph (88.51 km/h)50.4 mph (81.11 km/h)
60 mph (96.56 km/h)54.98 mph (88.48 km/h)
65 mph (104.61 km/h)59.56 mph (95.85 km/h)
70 mph (112.65 km/h)64.14 mph (103.23 km/h)
75 mph (120.7 km/h)68.72 mph (110.6 km/h)
80 mph (128.75 km/h)73.31 mph (117.97 km/h)
85 mph (136.79 km/h)77.89 mph (125.35 km/h)
90 mph (144.84 km/h)82.47 mph (132.72 km/h)
95 mph (152.89 km/h)87.05 mph (140.09 km/h)
100 mph (160.93 km/h)91.63 mph (147.47 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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