Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/50r15 vs 275/60r15 Tire Comparison Side By Side
  275/50-15 275/60-15 Difference
Diameter inches (mm) 25.83 (656) 27.99 (711) 2.17 (55) 8.4%
Width inches (mm) 10.83 (275) 10.83 (275) 0 (0) 0%
Circum. inches (mm) 81.14 (2060.88) 87.94 (2233.67) 6.8 (172.79) 8.4%
Sidewall Height inches (mm) 5.41 (137.5) 6.5 (165) 1.08 (27.5) 20%
Revolutions per mile (km) 780.9 (485.23) 720.49 (447.69) -60.41 (-37.54) -7.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.68 mph (34.89 km/h)
25 mph (40.23 km/h)27.1 mph (43.61 km/h)
30 mph (48.28 km/h)32.52 mph (52.33 km/h)
35 mph (56.33 km/h)37.93 mph (61.05 km/h)
40 mph (64.37 km/h)43.35 mph (69.77 km/h)
45 mph (72.42 km/h)48.77 mph (78.49 km/h)
50 mph (80.47 km/h)54.19 mph (87.21 km/h)
55 mph (88.51 km/h)59.61 mph (95.94 km/h)
60 mph (96.56 km/h)65.03 mph (104.66 km/h)
65 mph (104.61 km/h)70.45 mph (113.38 km/h)
70 mph (112.65 km/h)75.87 mph (122.1 km/h)
75 mph (120.7 km/h)81.29 mph (130.82 km/h)
80 mph (128.75 km/h)86.71 mph (139.54 km/h)
85 mph (136.79 km/h)92.13 mph (148.26 km/h)
90 mph (144.84 km/h)97.55 mph (156.98 km/h)
95 mph (152.89 km/h)102.96 mph (165.71 km/h)
100 mph (160.93 km/h)108.38 mph (174.43 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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