Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/35r20 vs 265/35r20 Tire Comparison Side By Side
  275/35-20 265/35-20 Difference
Diameter inches (mm) 27.58 (700.5) 27.3 (693.5) -0.28 (-7) -1%
Width inches (mm) 10.83 (275) 10.43 (265) -0.39 (-10) -3.6%
Circum. inches (mm) 86.64 (2200.69) 85.78 (2178.69) -0.87 (-21.99) -1%
Sidewall Height inches (mm) 3.79 (96.25) 3.65 (92.75) -0.14 (-3.5) -3.6%
Revolutions per mile (km) 731.29 (454.4) 738.67 (458.99) 7.38 (4.59) 1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.8 mph (31.87 km/h)
25 mph (40.23 km/h)24.75 mph (39.83 km/h)
30 mph (48.28 km/h)29.7 mph (47.8 km/h)
35 mph (56.33 km/h)34.65 mph (55.76 km/h)
40 mph (64.37 km/h)39.6 mph (63.73 km/h)
45 mph (72.42 km/h)44.55 mph (71.7 km/h)
50 mph (80.47 km/h)49.5 mph (79.66 km/h)
55 mph (88.51 km/h)54.45 mph (87.63 km/h)
60 mph (96.56 km/h)59.4 mph (95.6 km/h)
65 mph (104.61 km/h)64.35 mph (103.56 km/h)
70 mph (112.65 km/h)69.3 mph (111.53 km/h)
75 mph (120.7 km/h)74.25 mph (119.49 km/h)
80 mph (128.75 km/h)79.2 mph (127.46 km/h)
85 mph (136.79 km/h)84.15 mph (135.43 km/h)
90 mph (144.84 km/h)89.1 mph (143.39 km/h)
95 mph (152.89 km/h)94.05 mph (151.36 km/h)
100 mph (160.93 km/h)99 mph (159.33 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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