Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
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295/70r20 vs 33/12.5r20 Tire Comparison Side By Side
  295/70-20 33/12.5-20 Difference
Diameter inches (mm) 36.26 (921) 33.02 (838.72) -3.24 (-82.28) -8.9%
Width inches (mm) 11.61 (295) 12.52 (318) 0.91 (23) 7.8%
Circum. inches (mm) 113.91 (2893.41) 103.74 (2634.92) -10.18 (-258.49) -8.9%
Sidewall Height inches (mm) 8.13 (206.5) 6.51 (165.36) -1.62 (-41.14) -19.9%
Revolutions per mile (km) 556.21 (345.61) 610.78 (379.52) 54.57 (33.91) 9.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.21 mph (29.31 km/h)
25 mph (40.23 km/h)22.77 mph (36.64 km/h)
30 mph (48.28 km/h)27.32 mph (43.97 km/h)
35 mph (56.33 km/h)31.87 mph (51.3 km/h)
40 mph (64.37 km/h)36.43 mph (58.62 km/h)
45 mph (72.42 km/h)40.98 mph (65.95 km/h)
50 mph (80.47 km/h)45.53 mph (73.28 km/h)
55 mph (88.51 km/h)50.09 mph (80.61 km/h)
60 mph (96.56 km/h)54.64 mph (87.93 km/h)
65 mph (104.61 km/h)59.19 mph (95.26 km/h)
70 mph (112.65 km/h)63.75 mph (102.59 km/h)
75 mph (120.7 km/h)68.3 mph (109.92 km/h)
80 mph (128.75 km/h)72.85 mph (117.25 km/h)
85 mph (136.79 km/h)77.41 mph (124.57 km/h)
90 mph (144.84 km/h)81.96 mph (131.9 km/h)
95 mph (152.89 km/h)86.51 mph (139.23 km/h)
100 mph (160.93 km/h)91.07 mph (146.56 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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