Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
295/25r21 vs 275/30r20 Tire Comparison Side By Side
  295/25-21 275/30-20 Difference
Diameter inches (mm) 26.81 (680.9) 26.5 (673) -0.31 (-7.9) -1.2%
Width inches (mm) 11.61 (295) 10.83 (275) -0.79 (-20) -6.8%
Circum. inches (mm) 84.22 (2139.11) 83.24 (2114.29) -0.98 (-24.82) -1.2%
Sidewall Height inches (mm) 2.9 (73.75) 3.25 (82.5) 0.34 (8.75) 11.9%
Revolutions per mile (km) 752.34 (467.48) 761.17 (472.97) 8.83 (5.49) 1.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.77 mph (31.81 km/h)
25 mph (40.23 km/h)24.71 mph (39.77 km/h)
30 mph (48.28 km/h)29.65 mph (47.72 km/h)
35 mph (56.33 km/h)34.59 mph (55.67 km/h)
40 mph (64.37 km/h)39.54 mph (63.63 km/h)
45 mph (72.42 km/h)44.48 mph (71.58 km/h)
50 mph (80.47 km/h)49.42 mph (79.53 km/h)
55 mph (88.51 km/h)54.36 mph (87.49 km/h)
60 mph (96.56 km/h)59.3 mph (95.44 km/h)
65 mph (104.61 km/h)64.25 mph (103.39 km/h)
70 mph (112.65 km/h)69.19 mph (111.35 km/h)
75 mph (120.7 km/h)74.13 mph (119.3 km/h)
80 mph (128.75 km/h)79.07 mph (127.25 km/h)
85 mph (136.79 km/h)84.01 mph (135.21 km/h)
90 mph (144.84 km/h)88.96 mph (143.16 km/h)
95 mph (152.89 km/h)93.9 mph (151.11 km/h)
100 mph (160.93 km/h)98.84 mph (159.07 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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