Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/70r18 vs 265/65r18 Tire Comparison Side By Side
  255/70-18 265/65-18 Difference
Diameter inches (mm) 32.06 (814.2) 31.56 (801.7) -0.49 (-12.5) -1.5%
Width inches (mm) 10.04 (255) 10.43 (265) 0.39 (10) 3.9%
Circum. inches (mm) 100.7 (2557.88) 99.16 (2518.61) -1.55 (-39.27) -1.5%
Sidewall Height inches (mm) 7.03 (178.5) 6.78 (172.25) -0.25 (-6.25) -3.5%
Revolutions per mile (km) 629.17 (390.95) 638.98 (397.04) 9.81 (6.1) 1.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.69 mph (31.69 km/h)
25 mph (40.23 km/h)24.62 mph (39.62 km/h)
30 mph (48.28 km/h)29.54 mph (47.54 km/h)
35 mph (56.33 km/h)34.46 mph (55.46 km/h)
40 mph (64.37 km/h)39.39 mph (63.39 km/h)
45 mph (72.42 km/h)44.31 mph (71.31 km/h)
50 mph (80.47 km/h)49.23 mph (79.23 km/h)
55 mph (88.51 km/h)54.16 mph (87.16 km/h)
60 mph (96.56 km/h)59.08 mph (95.08 km/h)
65 mph (104.61 km/h)64 mph (103 km/h)
70 mph (112.65 km/h)68.93 mph (110.92 km/h)
75 mph (120.7 km/h)73.85 mph (118.85 km/h)
80 mph (128.75 km/h)78.77 mph (126.77 km/h)
85 mph (136.79 km/h)83.7 mph (134.69 km/h)
90 mph (144.84 km/h)88.62 mph (142.62 km/h)
95 mph (152.89 km/h)93.54 mph (150.54 km/h)
100 mph (160.93 km/h)98.46 mph (158.46 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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