Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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90/90r10 vs 130/70r12 Tire Comparison Side By Side
  90/90-10 130/70-12 Difference
Diameter inches (mm) 16.38 (416) 19.17 (486.8) 2.79 (70.8) 17%
Width inches (mm) 3.54 (90) 5.12 (130) 1.57 (40) 44.4%
Circum. inches (mm) 51.45 (1306.9) 60.21 (1529.33) 8.76 (222.42) 17%
Sidewall Height inches (mm) 3.19 (81) 3.58 (91) 0.39 (10) 12.3%
Revolutions per mile (km) 1231.42 (765.17) 1052.32 (653.88) -179.1 (-111.29) -14.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)23.4 mph (37.66 km/h)
25 mph (40.23 km/h)29.25 mph (47.08 km/h)
30 mph (48.28 km/h)35.11 mph (56.5 km/h)
35 mph (56.33 km/h)40.96 mph (65.91 km/h)
40 mph (64.37 km/h)46.81 mph (75.33 km/h)
45 mph (72.42 km/h)52.66 mph (84.75 km/h)
50 mph (80.47 km/h)58.51 mph (94.16 km/h)
55 mph (88.51 km/h)64.36 mph (103.58 km/h)
60 mph (96.56 km/h)70.21 mph (112.99 km/h)
65 mph (104.61 km/h)76.06 mph (122.41 km/h)
70 mph (112.65 km/h)81.91 mph (131.83 km/h)
75 mph (120.7 km/h)87.76 mph (141.24 km/h)
80 mph (128.75 km/h)93.62 mph (150.66 km/h)
85 mph (136.79 km/h)99.47 mph (160.08 km/h)
90 mph (144.84 km/h)105.32 mph (169.49 km/h)
95 mph (152.89 km/h)111.17 mph (178.91 km/h)
100 mph (160.93 km/h)117.02 mph (188.32 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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