Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/80r20 vs 34/10.5r20 Tire Comparison Side By Side
  275/80-20 34/10.5-20 Difference
Diameter inches (mm) 37.32 (948) 34.09 (865.78) -3.24 (-82.22) -8.7%
Width inches (mm) 10.83 (275) 10.51 (267) -0.31 (-8) -2.9%
Circum. inches (mm) 117.25 (2978.23) 107.08 (2719.93) -10.17 (-258.3) -8.7%
Sidewall Height inches (mm) 8.66 (220) 7.04 (178.89) -1.62 (-41.11) -18.7%
Revolutions per mile (km) 540.37 (335.77) 591.69 (367.66) 51.32 (31.89) 9.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.27 mph (29.4 km/h)
25 mph (40.23 km/h)22.83 mph (36.74 km/h)
30 mph (48.28 km/h)27.4 mph (44.09 km/h)
35 mph (56.33 km/h)31.96 mph (51.44 km/h)
40 mph (64.37 km/h)36.53 mph (58.79 km/h)
45 mph (72.42 km/h)41.1 mph (66.14 km/h)
50 mph (80.47 km/h)45.66 mph (73.49 km/h)
55 mph (88.51 km/h)50.23 mph (80.84 km/h)
60 mph (96.56 km/h)54.8 mph (88.19 km/h)
65 mph (104.61 km/h)59.36 mph (95.53 km/h)
70 mph (112.65 km/h)63.93 mph (102.88 km/h)
75 mph (120.7 km/h)68.5 mph (110.23 km/h)
80 mph (128.75 km/h)73.06 mph (117.58 km/h)
85 mph (136.79 km/h)77.63 mph (124.93 km/h)
90 mph (144.84 km/h)82.19 mph (132.28 km/h)
95 mph (152.89 km/h)86.76 mph (139.63 km/h)
100 mph (160.93 km/h)91.33 mph (146.98 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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