Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
285/70r17 vs 275/70r17 Tire Comparison Side By Side
  285/70-17 275/70-17 Difference
Diameter inches (mm) 32.71 (830.8) 32.16 (816.8) -0.55 (-14) -1.7%
Width inches (mm) 11.22 (285) 10.83 (275) -0.39 (-10) -3.5%
Circum. inches (mm) 102.76 (2610.04) 101.03 (2566.05) -1.73 (-43.98) -1.7%
Sidewall Height inches (mm) 7.85 (199.5) 7.58 (192.5) -0.28 (-7) -3.5%
Revolutions per mile (km) 616.6 (383.14) 627.17 (389.7) 10.57 (6.57) 1.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.66 mph (31.64 km/h)
25 mph (40.23 km/h)24.58 mph (39.56 km/h)
30 mph (48.28 km/h)29.49 mph (47.47 km/h)
35 mph (56.33 km/h)34.41 mph (55.38 km/h)
40 mph (64.37 km/h)39.33 mph (63.29 km/h)
45 mph (72.42 km/h)44.24 mph (71.2 km/h)
50 mph (80.47 km/h)49.16 mph (79.11 km/h)
55 mph (88.51 km/h)54.07 mph (87.02 km/h)
60 mph (96.56 km/h)58.99 mph (94.93 km/h)
65 mph (104.61 km/h)63.9 mph (102.84 km/h)
70 mph (112.65 km/h)68.82 mph (110.76 km/h)
75 mph (120.7 km/h)73.74 mph (118.67 km/h)
80 mph (128.75 km/h)78.65 mph (126.58 km/h)
85 mph (136.79 km/h)83.57 mph (134.49 km/h)
90 mph (144.84 km/h)88.48 mph (142.4 km/h)
95 mph (152.89 km/h)93.4 mph (150.31 km/h)
100 mph (160.93 km/h)98.31 mph (158.22 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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