Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
295/30r20 vs 275/35r20 Tire Comparison Side By Side
  295/30-20 275/35-20 Difference
Diameter inches (mm) 26.97 (685) 27.58 (700.5) 0.61 (15.5) 2.3%
Width inches (mm) 11.61 (295) 10.83 (275) -0.79 (-20) -6.8%
Circum. inches (mm) 84.72 (2151.99) 86.64 (2200.69) 1.92 (48.69) 2.3%
Sidewall Height inches (mm) 3.48 (88.5) 3.79 (96.25) 0.31 (7.75) 8.8%
Revolutions per mile (km) 747.84 (464.69) 731.29 (454.4) -16.55 (-10.28) -2.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.45 mph (32.92 km/h)
25 mph (40.23 km/h)25.57 mph (41.14 km/h)
30 mph (48.28 km/h)30.68 mph (49.37 km/h)
35 mph (56.33 km/h)35.79 mph (57.6 km/h)
40 mph (64.37 km/h)40.91 mph (65.83 km/h)
45 mph (72.42 km/h)46.02 mph (74.06 km/h)
50 mph (80.47 km/h)51.13 mph (82.29 km/h)
55 mph (88.51 km/h)56.24 mph (90.52 km/h)
60 mph (96.56 km/h)61.36 mph (98.75 km/h)
65 mph (104.61 km/h)66.47 mph (106.97 km/h)
70 mph (112.65 km/h)71.58 mph (115.2 km/h)
75 mph (120.7 km/h)76.7 mph (123.43 km/h)
80 mph (128.75 km/h)81.81 mph (131.66 km/h)
85 mph (136.79 km/h)86.92 mph (139.89 km/h)
90 mph (144.84 km/h)92.04 mph (148.12 km/h)
95 mph (152.89 km/h)97.15 mph (156.35 km/h)
100 mph (160.93 km/h)102.26 mph (164.58 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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