Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
60/80r17 vs 60/90r17 Tire Comparison Side By Side
  60/80-17 60/90-17 Difference
Diameter inches (mm) 20.78 (527.8) 21.25 (539.8) 0.47 (12) 2.3%
Width inches (mm) 2.36 (60) 2.36 (60) 0 (0) 0%
Circum. inches (mm) 65.28 (1658.13) 66.77 (1695.83) 1.48 (37.7) 2.3%
Sidewall Height inches (mm) 1.89 (48) 2.13 (54) 0.24 (6) 12.5%
Revolutions per mile (km) 970.58 (603.09) 949 (589.68) -21.58 (-13.41) -2.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.45 mph (32.92 km/h)
25 mph (40.23 km/h)25.57 mph (41.15 km/h)
30 mph (48.28 km/h)30.68 mph (49.38 km/h)
35 mph (56.33 km/h)35.8 mph (57.61 km/h)
40 mph (64.37 km/h)40.91 mph (65.84 km/h)
45 mph (72.42 km/h)46.02 mph (74.07 km/h)
50 mph (80.47 km/h)51.14 mph (82.3 km/h)
55 mph (88.51 km/h)56.25 mph (90.53 km/h)
60 mph (96.56 km/h)61.36 mph (98.76 km/h)
65 mph (104.61 km/h)66.48 mph (106.99 km/h)
70 mph (112.65 km/h)71.59 mph (115.22 km/h)
75 mph (120.7 km/h)76.71 mph (123.45 km/h)
80 mph (128.75 km/h)81.82 mph (131.67 km/h)
85 mph (136.79 km/h)86.93 mph (139.9 km/h)
90 mph (144.84 km/h)92.05 mph (148.13 km/h)
95 mph (152.89 km/h)97.16 mph (156.36 km/h)
100 mph (160.93 km/h)102.27 mph (164.59 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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