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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285/70r15 vs 295/65r15 Tire Comparison Side By Side
  285/70-15 295/65-15 Difference
Diameter inches (mm) 30.71 (780) 30.1 (764.5) -0.61 (-15.5) -2%
Width inches (mm) 11.22 (285) 11.61 (295) 0.39 (10) 3.5%
Circum. inches (mm) 96.47 (2450.44) 94.56 (2401.75) -1.92 (-48.69) -2%
Sidewall Height inches (mm) 7.85 (199.5) 7.55 (191.75) -0.31 (-7.75) -3.9%
Revolutions per mile (km) 656.76 (408.09) 670.07 (416.36) 13.32 (8.27) 2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.6 mph (31.55 km/h)
25 mph (40.23 km/h)24.5 mph (39.43 km/h)
30 mph (48.28 km/h)29.4 mph (47.32 km/h)
35 mph (56.33 km/h)34.3 mph (55.21 km/h)
40 mph (64.37 km/h)39.21 mph (63.09 km/h)
45 mph (72.42 km/h)44.11 mph (70.98 km/h)
50 mph (80.47 km/h)49.01 mph (78.87 km/h)
55 mph (88.51 km/h)53.91 mph (86.76 km/h)
60 mph (96.56 km/h)58.81 mph (94.64 km/h)
65 mph (104.61 km/h)63.71 mph (102.53 km/h)
70 mph (112.65 km/h)68.61 mph (110.42 km/h)
75 mph (120.7 km/h)73.51 mph (118.3 km/h)
80 mph (128.75 km/h)78.41 mph (126.19 km/h)
85 mph (136.79 km/h)83.31 mph (134.08 km/h)
90 mph (144.84 km/h)88.21 mph (141.96 km/h)
95 mph (152.89 km/h)93.11 mph (149.85 km/h)
100 mph (160.93 km/h)98.01 mph (157.74 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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