Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/50r13 vs 235/50r13.5 Tire Comparison Side By Side
  195/50-13 235/50-13.5 Difference
Diameter inches (mm) 20.68 (525.2) 22.75 (577.9) 2.07 (52.7) 10%
Width inches (mm) 7.68 (195) 9.25 (235) 1.57 (40) 20.5%
Circum. inches (mm) 64.96 (1649.96) 71.48 (1815.53) 6.52 (165.56) 10%
Sidewall Height inches (mm) 3.84 (97.5) 4.63 (117.5) 0.79 (20) 20.5%
Revolutions per mile (km) 975.38 (606.07) 886.43 (550.8) -88.95 (-55.27) -9.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.01 mph (35.42 km/h)
25 mph (40.23 km/h)27.51 mph (44.27 km/h)
30 mph (48.28 km/h)33.01 mph (53.13 km/h)
35 mph (56.33 km/h)38.51 mph (61.98 km/h)
40 mph (64.37 km/h)44.01 mph (70.83 km/h)
45 mph (72.42 km/h)49.52 mph (79.69 km/h)
50 mph (80.47 km/h)55.02 mph (88.54 km/h)
55 mph (88.51 km/h)60.52 mph (97.4 km/h)
60 mph (96.56 km/h)66.02 mph (106.25 km/h)
65 mph (104.61 km/h)71.52 mph (115.1 km/h)
70 mph (112.65 km/h)77.02 mph (123.96 km/h)
75 mph (120.7 km/h)82.53 mph (132.81 km/h)
80 mph (128.75 km/h)88.03 mph (141.67 km/h)
85 mph (136.79 km/h)93.53 mph (150.52 km/h)
90 mph (144.84 km/h)99.03 mph (159.38 km/h)
95 mph (152.89 km/h)104.53 mph (168.23 km/h)
100 mph (160.93 km/h)110.03 mph (177.08 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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