Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/70r19 vs 285/70r19.5 Tire Comparison Side By Side
  265/70-19 285/70-19.5 Difference
Diameter inches (mm) 33.61 (853.6) 35.21 (894.3) 1.6 (40.7) 4.8%
Width inches (mm) 10.43 (265) 11.22 (285) 0.79 (20) 7.5%
Circum. inches (mm) 105.58 (2681.66) 110.61 (2809.53) 5.03 (127.86) 4.8%
Sidewall Height inches (mm) 7.3 (185.5) 7.85 (199.5) 0.55 (14) 7.5%
Revolutions per mile (km) 600.13 (372.9) 572.82 (355.93) -27.31 (-16.97) -4.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.95 mph (33.72 km/h)
25 mph (40.23 km/h)26.19 mph (42.15 km/h)
30 mph (48.28 km/h)31.43 mph (50.58 km/h)
35 mph (56.33 km/h)36.67 mph (59.01 km/h)
40 mph (64.37 km/h)41.91 mph (67.44 km/h)
45 mph (72.42 km/h)47.15 mph (75.87 km/h)
50 mph (80.47 km/h)52.38 mph (84.3 km/h)
55 mph (88.51 km/h)57.62 mph (92.73 km/h)
60 mph (96.56 km/h)62.86 mph (101.16 km/h)
65 mph (104.61 km/h)68.1 mph (109.6 km/h)
70 mph (112.65 km/h)73.34 mph (118.03 km/h)
75 mph (120.7 km/h)78.58 mph (126.46 km/h)
80 mph (128.75 km/h)83.81 mph (134.89 km/h)
85 mph (136.79 km/h)89.05 mph (143.32 km/h)
90 mph (144.84 km/h)94.29 mph (151.75 km/h)
95 mph (152.89 km/h)99.53 mph (160.18 km/h)
100 mph (160.93 km/h)104.77 mph (168.61 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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