Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/65r18 vs 265/70r17 Tire Comparison Side By Side
  275/65-18 265/70-17 Difference
Diameter inches (mm) 32.07 (814.7) 31.61 (802.8) -0.47 (-11.9) -1.5%
Width inches (mm) 10.83 (275) 10.43 (265) -0.39 (-10) -3.6%
Circum. inches (mm) 100.77 (2559.46) 99.29 (2522.07) -1.47 (-37.38) -1.5%
Sidewall Height inches (mm) 7.04 (178.75) 7.3 (185.5) 0.27 (6.75) 3.8%
Revolutions per mile (km) 628.78 (390.71) 638.1 (396.5) 9.32 (5.79) 1.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.71 mph (31.72 km/h)
25 mph (40.23 km/h)24.63 mph (39.65 km/h)
30 mph (48.28 km/h)29.56 mph (47.58 km/h)
35 mph (56.33 km/h)34.49 mph (55.5 km/h)
40 mph (64.37 km/h)39.42 mph (63.43 km/h)
45 mph (72.42 km/h)44.34 mph (71.36 km/h)
50 mph (80.47 km/h)49.27 mph (79.29 km/h)
55 mph (88.51 km/h)54.2 mph (87.22 km/h)
60 mph (96.56 km/h)59.12 mph (95.15 km/h)
65 mph (104.61 km/h)64.05 mph (103.08 km/h)
70 mph (112.65 km/h)68.98 mph (111.01 km/h)
75 mph (120.7 km/h)73.9 mph (118.94 km/h)
80 mph (128.75 km/h)78.83 mph (126.87 km/h)
85 mph (136.79 km/h)83.76 mph (134.8 km/h)
90 mph (144.84 km/h)88.69 mph (142.73 km/h)
95 mph (152.89 km/h)93.61 mph (150.65 km/h)
100 mph (160.93 km/h)98.54 mph (158.58 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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