Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/75r14 vs 195/50r15 Tire Comparison Side By Side
  165/75-14 195/50-15 Difference
Diameter inches (mm) 23.74 (603.1) 22.68 (576) -1.07 (-27.1) -4.5%
Width inches (mm) 6.5 (165) 7.68 (195) 1.18 (30) 18.2%
Circum. inches (mm) 74.59 (1894.69) 71.24 (1809.56) -3.35 (-85.14) -4.5%
Sidewall Height inches (mm) 4.87 (123.75) 3.84 (97.5) -1.03 (-26.25) -21.2%
Revolutions per mile (km) 849.39 (527.79) 889.36 (552.62) 39.96 (24.83) 4.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.1 mph (30.74 km/h)
25 mph (40.23 km/h)23.88 mph (38.43 km/h)
30 mph (48.28 km/h)28.65 mph (46.11 km/h)
35 mph (56.33 km/h)33.43 mph (53.8 km/h)
40 mph (64.37 km/h)38.2 mph (61.48 km/h)
45 mph (72.42 km/h)42.98 mph (69.17 km/h)
50 mph (80.47 km/h)47.75 mph (76.85 km/h)
55 mph (88.51 km/h)52.53 mph (84.54 km/h)
60 mph (96.56 km/h)57.3 mph (92.22 km/h)
65 mph (104.61 km/h)62.08 mph (99.91 km/h)
70 mph (112.65 km/h)66.85 mph (107.59 km/h)
75 mph (120.7 km/h)71.63 mph (115.28 km/h)
80 mph (128.75 km/h)76.41 mph (122.96 km/h)
85 mph (136.79 km/h)81.18 mph (130.65 km/h)
90 mph (144.84 km/h)85.96 mph (138.33 km/h)
95 mph (152.89 km/h)90.73 mph (146.02 km/h)
100 mph (160.93 km/h)95.51 mph (153.7 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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