Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/60r17 vs 275/60r17 Tire Comparison Side By Side
  255/60-17 275/60-17 Difference
Diameter inches (mm) 29.05 (737.8) 29.99 (761.8) 0.94 (24) 3.3%
Width inches (mm) 10.04 (255) 10.83 (275) 0.79 (20) 7.8%
Circum. inches (mm) 91.25 (2317.87) 94.22 (2393.27) 2.97 (75.4) 3.3%
Sidewall Height inches (mm) 6.02 (153) 6.5 (165) 0.47 (12) 7.8%
Revolutions per mile (km) 694.32 (431.43) 672.45 (417.84) -21.87 (-13.59) -3.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.65 mph (33.23 km/h)
25 mph (40.23 km/h)25.81 mph (41.54 km/h)
30 mph (48.28 km/h)30.98 mph (49.85 km/h)
35 mph (56.33 km/h)36.14 mph (58.16 km/h)
40 mph (64.37 km/h)41.3 mph (66.47 km/h)
45 mph (72.42 km/h)46.46 mph (74.78 km/h)
50 mph (80.47 km/h)51.63 mph (83.08 km/h)
55 mph (88.51 km/h)56.79 mph (91.39 km/h)
60 mph (96.56 km/h)61.95 mph (99.7 km/h)
65 mph (104.61 km/h)67.11 mph (108.01 km/h)
70 mph (112.65 km/h)72.28 mph (116.32 km/h)
75 mph (120.7 km/h)77.44 mph (124.63 km/h)
80 mph (128.75 km/h)82.6 mph (132.94 km/h)
85 mph (136.79 km/h)87.76 mph (141.24 km/h)
90 mph (144.84 km/h)92.93 mph (149.55 km/h)
95 mph (152.89 km/h)98.09 mph (157.86 km/h)
100 mph (160.93 km/h)103.25 mph (166.17 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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