Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/60r15 vs 235/70r15 Tire Comparison Side By Side
  235/60-15 235/70-15 Difference
Diameter inches (mm) 26.1 (663) 27.95 (710) 1.85 (47) 7.1%
Width inches (mm) 9.25 (235) 9.25 (235) 0 (0) 0%
Circum. inches (mm) 82 (2082.88) 87.82 (2230.53) 5.81 (147.65) 7.1%
Sidewall Height inches (mm) 5.55 (141) 6.48 (164.5) 0.93 (23.5) 16.7%
Revolutions per mile (km) 772.65 (480.1) 721.51 (448.32) -51.15 (-31.78) -6.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.42 mph (34.47 km/h)
25 mph (40.23 km/h)26.77 mph (43.09 km/h)
30 mph (48.28 km/h)32.13 mph (51.7 km/h)
35 mph (56.33 km/h)37.48 mph (60.32 km/h)
40 mph (64.37 km/h)42.84 mph (68.94 km/h)
45 mph (72.42 km/h)48.19 mph (77.55 km/h)
50 mph (80.47 km/h)53.54 mph (86.17 km/h)
55 mph (88.51 km/h)58.9 mph (94.79 km/h)
60 mph (96.56 km/h)64.25 mph (103.41 km/h)
65 mph (104.61 km/h)69.61 mph (112.02 km/h)
70 mph (112.65 km/h)74.96 mph (120.64 km/h)
75 mph (120.7 km/h)80.32 mph (129.26 km/h)
80 mph (128.75 km/h)85.67 mph (137.87 km/h)
85 mph (136.79 km/h)91.03 mph (146.49 km/h)
90 mph (144.84 km/h)96.38 mph (155.11 km/h)
95 mph (152.89 km/h)101.73 mph (163.73 km/h)
100 mph (160.93 km/h)107.09 mph (172.34 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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