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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90/70r10 vs 80/65r10 Tire Comparison Side By Side
  90/70-10 80/65-10 Difference
Diameter inches (mm) 14.96 (380) 14.09 (358) -0.87 (-22) -5.8%
Width inches (mm) 3.54 (90) 3.15 (80) -0.39 (-10) -11.1%
Circum. inches (mm) 47 (1193.81) 44.28 (1124.69) -2.72 (-69.12) -5.8%
Sidewall Height inches (mm) 2.48 (63) 2.05 (52) -0.43 (-11) -17.5%
Revolutions per mile (km) 1348.08 (837.66) 1430.92 (889.13) 82.84 (51.48) 6.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.84 mph (30.32 km/h)
25 mph (40.23 km/h)23.55 mph (37.9 km/h)
30 mph (48.28 km/h)28.26 mph (45.49 km/h)
35 mph (56.33 km/h)32.97 mph (53.07 km/h)
40 mph (64.37 km/h)37.68 mph (60.65 km/h)
45 mph (72.42 km/h)42.39 mph (68.23 km/h)
50 mph (80.47 km/h)47.11 mph (75.81 km/h)
55 mph (88.51 km/h)51.82 mph (83.39 km/h)
60 mph (96.56 km/h)56.53 mph (90.97 km/h)
65 mph (104.61 km/h)61.24 mph (98.55 km/h)
70 mph (112.65 km/h)65.95 mph (106.13 km/h)
75 mph (120.7 km/h)70.66 mph (113.71 km/h)
80 mph (128.75 km/h)75.37 mph (121.29 km/h)
85 mph (136.79 km/h)80.08 mph (128.87 km/h)
90 mph (144.84 km/h)84.79 mph (136.46 km/h)
95 mph (152.89 km/h)89.5 mph (144.04 km/h)
100 mph (160.93 km/h)94.21 mph (151.62 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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