Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/70r15 vs 295/50r15 Tire Comparison Side By Side
  285/70-15 295/50-15 Difference
Diameter inches (mm) 30.71 (780) 26.61 (676) -4.09 (-104) -13.3%
Width inches (mm) 11.22 (285) 11.61 (295) 0.39 (10) 3.5%
Circum. inches (mm) 96.47 (2450.44) 83.61 (2123.72) -12.86 (-326.73) -13.3%
Sidewall Height inches (mm) 7.85 (199.5) 5.81 (147.5) -2.05 (-52) -26.1%
Revolutions per mile (km) 656.76 (408.09) 757.8 (470.87) 101.04 (62.78) 15.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.33 mph (27.9 km/h)
25 mph (40.23 km/h)21.67 mph (34.87 km/h)
30 mph (48.28 km/h)26 mph (41.84 km/h)
35 mph (56.33 km/h)30.33 mph (48.82 km/h)
40 mph (64.37 km/h)34.67 mph (55.79 km/h)
45 mph (72.42 km/h)39 mph (62.76 km/h)
50 mph (80.47 km/h)43.33 mph (69.74 km/h)
55 mph (88.51 km/h)47.67 mph (76.71 km/h)
60 mph (96.56 km/h)52 mph (83.69 km/h)
65 mph (104.61 km/h)56.33 mph (90.66 km/h)
70 mph (112.65 km/h)60.67 mph (97.63 km/h)
75 mph (120.7 km/h)65 mph (104.61 km/h)
80 mph (128.75 km/h)69.33 mph (111.58 km/h)
85 mph (136.79 km/h)73.67 mph (118.56 km/h)
90 mph (144.84 km/h)78 mph (125.53 km/h)
95 mph (152.89 km/h)82.33 mph (132.5 km/h)
100 mph (160.93 km/h)86.67 mph (139.48 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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