Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/65r17 vs 275/65r18 Tire Comparison Side By Side
  265/65-17 275/65-18 Difference
Diameter inches (mm) 30.56 (776.3) 32.07 (814.7) 1.51 (38.4) 4.9%
Width inches (mm) 10.43 (265) 10.83 (275) 0.39 (10) 3.8%
Circum. inches (mm) 96.02 (2438.82) 100.77 (2559.46) 4.75 (120.64) 4.9%
Sidewall Height inches (mm) 6.78 (172.25) 7.04 (178.75) 0.26 (6.5) 3.8%
Revolutions per mile (km) 659.89 (410.03) 628.78 (390.71) -31.1 (-19.33) -4.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.99 mph (33.78 km/h)
25 mph (40.23 km/h)26.24 mph (42.22 km/h)
30 mph (48.28 km/h)31.48 mph (50.67 km/h)
35 mph (56.33 km/h)36.73 mph (59.11 km/h)
40 mph (64.37 km/h)41.98 mph (67.56 km/h)
45 mph (72.42 km/h)47.23 mph (76 km/h)
50 mph (80.47 km/h)52.47 mph (84.45 km/h)
55 mph (88.51 km/h)57.72 mph (92.89 km/h)
60 mph (96.56 km/h)62.97 mph (101.34 km/h)
65 mph (104.61 km/h)68.22 mph (109.78 km/h)
70 mph (112.65 km/h)73.46 mph (118.23 km/h)
75 mph (120.7 km/h)78.71 mph (126.67 km/h)
80 mph (128.75 km/h)83.96 mph (135.12 km/h)
85 mph (136.79 km/h)89.2 mph (143.56 km/h)
90 mph (144.84 km/h)94.45 mph (152.01 km/h)
95 mph (152.89 km/h)99.7 mph (160.45 km/h)
100 mph (160.93 km/h)104.95 mph (168.9 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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