Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
155/50r15 vs 24/7.5r15 Tire Comparison Side By Side
  155/50-15 24/7.5-15 Difference
Diameter inches (mm) 21.1 (536) 24.02 (610.2) 2.92 (74.2) 13.8%
Width inches (mm) 6.1 (155) 7.52 (191) 1.42 (36) 23.2%
Circum. inches (mm) 66.3 (1683.89) 75.47 (1917) 9.18 (233.11) 13.8%
Sidewall Height inches (mm) 3.05 (77.5) 4.51 (114.6) 1.46 (37.1) 47.9%
Revolutions per mile (km) 955.73 (593.86) 839.51 (521.65) -116.22 (-72.21) -12.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.77 mph (36.64 km/h)
25 mph (40.23 km/h)28.46 mph (45.8 km/h)
30 mph (48.28 km/h)34.15 mph (54.96 km/h)
35 mph (56.33 km/h)39.85 mph (64.12 km/h)
40 mph (64.37 km/h)45.54 mph (73.29 km/h)
45 mph (72.42 km/h)51.23 mph (82.45 km/h)
50 mph (80.47 km/h)56.92 mph (91.61 km/h)
55 mph (88.51 km/h)62.61 mph (100.77 km/h)
60 mph (96.56 km/h)68.31 mph (109.93 km/h)
65 mph (104.61 km/h)74 mph (119.09 km/h)
70 mph (112.65 km/h)79.69 mph (128.25 km/h)
75 mph (120.7 km/h)85.38 mph (137.41 km/h)
80 mph (128.75 km/h)91.07 mph (146.57 km/h)
85 mph (136.79 km/h)96.77 mph (155.73 km/h)
90 mph (144.84 km/h)102.46 mph (164.89 km/h)
95 mph (152.89 km/h)108.15 mph (174.05 km/h)
100 mph (160.93 km/h)113.84 mph (183.21 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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