Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
240/50r16 vs 340/55r16 Tire Comparison Side By Side
  240/50-16 340/55-16 Difference
Diameter inches (mm) 25.45 (646.4) 30.72 (780.4) 5.28 (134) 20.7%
Width inches (mm) 9.45 (240) 13.39 (340) 3.94 (100) 41.7%
Circum. inches (mm) 79.95 (2030.73) 96.52 (2451.7) 16.57 (420.97) 20.7%
Sidewall Height inches (mm) 4.72 (120) 7.36 (187) 2.64 (67) 55.8%
Revolutions per mile (km) 792.5 (492.43) 656.42 (407.88) -136.08 (-84.55) -17.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)24.15 mph (38.86 km/h)
25 mph (40.23 km/h)30.18 mph (48.57 km/h)
30 mph (48.28 km/h)36.22 mph (58.29 km/h)
35 mph (56.33 km/h)42.26 mph (68 km/h)
40 mph (64.37 km/h)48.29 mph (77.72 km/h)
45 mph (72.42 km/h)54.33 mph (87.43 km/h)
50 mph (80.47 km/h)60.37 mph (97.15 km/h)
55 mph (88.51 km/h)66.4 mph (106.86 km/h)
60 mph (96.56 km/h)72.44 mph (116.58 km/h)
65 mph (104.61 km/h)78.47 mph (126.29 km/h)
70 mph (112.65 km/h)84.51 mph (136.01 km/h)
75 mph (120.7 km/h)90.55 mph (145.72 km/h)
80 mph (128.75 km/h)96.58 mph (155.44 km/h)
85 mph (136.79 km/h)102.62 mph (165.15 km/h)
90 mph (144.84 km/h)108.66 mph (174.87 km/h)
95 mph (152.89 km/h)114.69 mph (184.58 km/h)
100 mph (160.93 km/h)120.73 mph (194.3 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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