Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/60r17 vs 265/65r17 Tire Comparison Side By Side
  255/60-17 265/65-17 Difference
Diameter inches (mm) 29.05 (737.8) 30.56 (776.3) 1.52 (38.5) 5.2%
Width inches (mm) 10.04 (255) 10.43 (265) 0.39 (10) 3.9%
Circum. inches (mm) 91.25 (2317.87) 96.02 (2438.82) 4.76 (120.95) 5.2%
Sidewall Height inches (mm) 6.02 (153) 6.78 (172.25) 0.76 (19.25) 12.6%
Revolutions per mile (km) 694.32 (431.43) 659.89 (410.03) -34.43 (-21.4) -5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.04 mph (33.87 km/h)
25 mph (40.23 km/h)26.3 mph (42.33 km/h)
30 mph (48.28 km/h)31.57 mph (50.8 km/h)
35 mph (56.33 km/h)36.83 mph (59.27 km/h)
40 mph (64.37 km/h)42.09 mph (67.73 km/h)
45 mph (72.42 km/h)47.35 mph (76.2 km/h)
50 mph (80.47 km/h)52.61 mph (84.67 km/h)
55 mph (88.51 km/h)57.87 mph (93.13 km/h)
60 mph (96.56 km/h)63.13 mph (101.6 km/h)
65 mph (104.61 km/h)68.39 mph (110.07 km/h)
70 mph (112.65 km/h)73.65 mph (118.53 km/h)
75 mph (120.7 km/h)78.91 mph (127 km/h)
80 mph (128.75 km/h)84.17 mph (135.47 km/h)
85 mph (136.79 km/h)89.44 mph (143.93 km/h)
90 mph (144.84 km/h)94.7 mph (152.4 km/h)
95 mph (152.89 km/h)99.96 mph (160.87 km/h)
100 mph (160.93 km/h)105.22 mph (169.33 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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