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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130/70r12 vs 140/70r12 Tire Comparison Side By Side
  130/70-12 140/70-12 Difference
Diameter inches (mm) 19.17 (486.8) 19.72 (500.8) 0.55 (14) 2.9%
Width inches (mm) 5.12 (130) 5.51 (140) 0.39 (10) 7.7%
Circum. inches (mm) 60.21 (1529.33) 61.94 (1573.31) 1.73 (43.98) 2.9%
Sidewall Height inches (mm) 3.58 (91) 3.86 (98) 0.28 (7) 7.7%
Revolutions per mile (km) 1052.32 (653.88) 1022.9 (635.6) -29.42 (-18.28) -2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.58 mph (33.11 km/h)
25 mph (40.23 km/h)25.72 mph (41.39 km/h)
30 mph (48.28 km/h)30.86 mph (49.67 km/h)
35 mph (56.33 km/h)36.01 mph (57.95 km/h)
40 mph (64.37 km/h)41.15 mph (66.23 km/h)
45 mph (72.42 km/h)46.29 mph (74.5 km/h)
50 mph (80.47 km/h)51.44 mph (82.78 km/h)
55 mph (88.51 km/h)56.58 mph (91.06 km/h)
60 mph (96.56 km/h)61.73 mph (99.34 km/h)
65 mph (104.61 km/h)66.87 mph (107.62 km/h)
70 mph (112.65 km/h)72.01 mph (115.89 km/h)
75 mph (120.7 km/h)77.16 mph (124.17 km/h)
80 mph (128.75 km/h)82.3 mph (132.45 km/h)
85 mph (136.79 km/h)87.44 mph (140.73 km/h)
90 mph (144.84 km/h)92.59 mph (149.01 km/h)
95 mph (152.89 km/h)97.73 mph (157.28 km/h)
100 mph (160.93 km/h)102.88 mph (165.56 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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