Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/80r15 vs 205/60r15 Tire Comparison Side By Side
  205/80-15 205/60-15 Difference
Diameter inches (mm) 27.91 (709) 24.69 (627) -3.23 (-82) -11.6%
Width inches (mm) 8.07 (205) 8.07 (205) 0 (0) 0%
Circum. inches (mm) 87.69 (2227.39) 77.55 (1969.78) -10.14 (-257.61) -11.6%
Sidewall Height inches (mm) 6.46 (164) 4.84 (123) -1.61 (-41) -25%
Revolutions per mile (km) 722.52 (448.96) 817.02 (507.67) 94.49 (58.72) 13.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)17.69 mph (28.46 km/h)
25 mph (40.23 km/h)22.11 mph (35.58 km/h)
30 mph (48.28 km/h)26.53 mph (42.7 km/h)
35 mph (56.33 km/h)30.95 mph (49.81 km/h)
40 mph (64.37 km/h)35.37 mph (56.93 km/h)
45 mph (72.42 km/h)39.8 mph (64.04 km/h)
50 mph (80.47 km/h)44.22 mph (71.16 km/h)
55 mph (88.51 km/h)48.64 mph (78.28 km/h)
60 mph (96.56 km/h)53.06 mph (85.39 km/h)
65 mph (104.61 km/h)57.48 mph (92.51 km/h)
70 mph (112.65 km/h)61.9 mph (99.63 km/h)
75 mph (120.7 km/h)66.33 mph (106.74 km/h)
80 mph (128.75 km/h)70.75 mph (113.86 km/h)
85 mph (136.79 km/h)75.17 mph (120.97 km/h)
90 mph (144.84 km/h)79.59 mph (128.09 km/h)
95 mph (152.89 km/h)84.01 mph (135.21 km/h)
100 mph (160.93 km/h)88.43 mph (142.32 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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