Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/50r16 vs 275/60r15 Tire Comparison Side By Side
  255/50-16 275/60-15 Difference
Diameter inches (mm) 26.04 (661.4) 27.99 (711) 1.95 (49.6) 7.5%
Width inches (mm) 10.04 (255) 10.83 (275) 0.79 (20) 7.8%
Circum. inches (mm) 81.81 (2077.85) 87.94 (2233.67) 6.13 (155.82) 7.5%
Sidewall Height inches (mm) 5.02 (127.5) 6.5 (165) 1.48 (37.5) 29.4%
Revolutions per mile (km) 774.52 (481.27) 720.49 (447.69) -54.03 (-33.57) -7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.5 mph (34.6 km/h)
25 mph (40.23 km/h)26.87 mph (43.25 km/h)
30 mph (48.28 km/h)32.25 mph (51.9 km/h)
35 mph (56.33 km/h)37.62 mph (60.55 km/h)
40 mph (64.37 km/h)43 mph (69.2 km/h)
45 mph (72.42 km/h)48.37 mph (77.85 km/h)
50 mph (80.47 km/h)53.75 mph (86.5 km/h)
55 mph (88.51 km/h)59.12 mph (95.15 km/h)
60 mph (96.56 km/h)64.5 mph (103.8 km/h)
65 mph (104.61 km/h)69.87 mph (112.45 km/h)
70 mph (112.65 km/h)75.25 mph (121.1 km/h)
75 mph (120.7 km/h)80.62 mph (129.75 km/h)
80 mph (128.75 km/h)86 mph (138.4 km/h)
85 mph (136.79 km/h)91.37 mph (147.05 km/h)
90 mph (144.84 km/h)96.75 mph (155.7 km/h)
95 mph (152.89 km/h)102.12 mph (164.35 km/h)
100 mph (160.93 km/h)107.5 mph (173 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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