Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
190/55r15 vs 160/50r15 Tire Comparison Side By Side
  190/55-15 160/50-15 Difference
Diameter inches (mm) 23.23 (590) 21.3 (541) -1.93 (-49) -8.3%
Width inches (mm) 7.48 (190) 6.3 (160) -1.18 (-30) -15.8%
Circum. inches (mm) 72.97 (1853.54) 66.91 (1699.6) -6.06 (-153.94) -8.3%
Sidewall Height inches (mm) 4.11 (104.5) 3.15 (80) -0.96 (-24.5) -23.4%
Revolutions per mile (km) 868.25 (539.51) 946.89 (588.37) 78.64 (48.86) 9.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.34 mph (29.51 km/h)
25 mph (40.23 km/h)22.92 mph (36.89 km/h)
30 mph (48.28 km/h)27.51 mph (44.27 km/h)
35 mph (56.33 km/h)32.09 mph (51.65 km/h)
40 mph (64.37 km/h)36.68 mph (59.03 km/h)
45 mph (72.42 km/h)41.26 mph (66.41 km/h)
50 mph (80.47 km/h)45.85 mph (73.78 km/h)
55 mph (88.51 km/h)50.43 mph (81.16 km/h)
60 mph (96.56 km/h)55.02 mph (88.54 km/h)
65 mph (104.61 km/h)59.6 mph (95.92 km/h)
70 mph (112.65 km/h)64.19 mph (103.3 km/h)
75 mph (120.7 km/h)68.77 mph (110.68 km/h)
80 mph (128.75 km/h)73.36 mph (118.06 km/h)
85 mph (136.79 km/h)77.94 mph (125.43 km/h)
90 mph (144.84 km/h)82.53 mph (132.81 km/h)
95 mph (152.89 km/h)87.11 mph (140.19 km/h)
100 mph (160.93 km/h)91.69 mph (147.57 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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