Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
305/60r17 vs 305/70r17 Tire Comparison Side By Side
  305/60-17 305/70-17 Difference
Diameter inches (mm) 31.41 (797.8) 33.81 (858.8) 2.4 (61) 7.6%
Width inches (mm) 12.01 (305) 12.01 (305) 0 (0) 0%
Circum. inches (mm) 98.68 (2506.36) 106.22 (2698) 7.54 (191.64) 7.6%
Sidewall Height inches (mm) 7.2 (183) 8.41 (213.5) 1.2 (30.5) 16.7%
Revolutions per mile (km) 642.1 (398.98) 596.5 (370.64) -45.61 (-28.34) -7.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.53 mph (34.65 km/h)
25 mph (40.23 km/h)26.91 mph (43.31 km/h)
30 mph (48.28 km/h)32.29 mph (51.97 km/h)
35 mph (56.33 km/h)37.68 mph (60.63 km/h)
40 mph (64.37 km/h)43.06 mph (69.3 km/h)
45 mph (72.42 km/h)48.44 mph (77.96 km/h)
50 mph (80.47 km/h)53.82 mph (86.62 km/h)
55 mph (88.51 km/h)59.21 mph (95.28 km/h)
60 mph (96.56 km/h)64.59 mph (103.94 km/h)
65 mph (104.61 km/h)69.97 mph (112.61 km/h)
70 mph (112.65 km/h)75.35 mph (121.27 km/h)
75 mph (120.7 km/h)80.73 mph (129.93 km/h)
80 mph (128.75 km/h)86.12 mph (138.59 km/h)
85 mph (136.79 km/h)91.5 mph (147.25 km/h)
90 mph (144.84 km/h)96.88 mph (155.92 km/h)
95 mph (152.89 km/h)102.26 mph (164.58 km/h)
100 mph (160.93 km/h)107.65 mph (173.24 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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