Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/80r15 vs 265/75r15 Tire Comparison Side By Side
  275/80-15 265/75-15 Difference
Diameter inches (mm) 32.32 (821) 30.65 (778.5) -1.67 (-42.5) -5.2%
Width inches (mm) 10.83 (275) 10.43 (265) -0.39 (-10) -3.6%
Circum. inches (mm) 101.55 (2579.25) 96.29 (2445.73) -5.26 (-133.52) -5.2%
Sidewall Height inches (mm) 8.66 (220) 7.82 (198.75) -0.84 (-21.25) -9.7%
Revolutions per mile (km) 623.96 (387.71) 658.02 (408.88) 34.06 (21.17) 5.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.96 mph (30.52 km/h)
25 mph (40.23 km/h)23.71 mph (38.15 km/h)
30 mph (48.28 km/h)28.45 mph (45.78 km/h)
35 mph (56.33 km/h)33.19 mph (53.41 km/h)
40 mph (64.37 km/h)37.93 mph (61.04 km/h)
45 mph (72.42 km/h)42.67 mph (68.67 km/h)
50 mph (80.47 km/h)47.41 mph (76.3 km/h)
55 mph (88.51 km/h)52.15 mph (83.93 km/h)
60 mph (96.56 km/h)56.89 mph (91.56 km/h)
65 mph (104.61 km/h)61.64 mph (99.19 km/h)
70 mph (112.65 km/h)66.38 mph (106.82 km/h)
75 mph (120.7 km/h)71.12 mph (114.45 km/h)
80 mph (128.75 km/h)75.86 mph (122.08 km/h)
85 mph (136.79 km/h)80.6 mph (129.71 km/h)
90 mph (144.84 km/h)85.34 mph (137.34 km/h)
95 mph (152.89 km/h)90.08 mph (144.97 km/h)
100 mph (160.93 km/h)94.82 mph (152.6 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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