Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/40r17 vs 265/50r17 Tire Comparison Side By Side
  265/40-17 265/50-17 Difference
Diameter inches (mm) 25.35 (643.8) 27.43 (696.8) 2.09 (53) 8.2%
Width inches (mm) 10.43 (265) 10.43 (265) 0 (0) 0%
Circum. inches (mm) 79.63 (2022.56) 86.18 (2189.06) 6.56 (166.5) 8.2%
Sidewall Height inches (mm) 4.17 (106) 5.22 (132.5) 1.04 (26.5) 25%
Revolutions per mile (km) 795.7 (494.42) 735.18 (456.82) -60.52 (-37.61) -7.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.65 mph (34.84 km/h)
25 mph (40.23 km/h)27.06 mph (43.55 km/h)
30 mph (48.28 km/h)32.47 mph (52.26 km/h)
35 mph (56.33 km/h)37.88 mph (60.96 km/h)
40 mph (64.37 km/h)43.29 mph (69.67 km/h)
45 mph (72.42 km/h)48.7 mph (78.38 km/h)
50 mph (80.47 km/h)54.12 mph (87.09 km/h)
55 mph (88.51 km/h)59.53 mph (95.8 km/h)
60 mph (96.56 km/h)64.94 mph (104.51 km/h)
65 mph (104.61 km/h)70.35 mph (113.22 km/h)
70 mph (112.65 km/h)75.76 mph (121.93 km/h)
75 mph (120.7 km/h)81.17 mph (130.64 km/h)
80 mph (128.75 km/h)86.59 mph (139.35 km/h)
85 mph (136.79 km/h)92 mph (148.06 km/h)
90 mph (144.84 km/h)97.41 mph (156.77 km/h)
95 mph (152.89 km/h)102.82 mph (165.47 km/h)
100 mph (160.93 km/h)108.23 mph (174.18 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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