Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/30r21 vs 295/25r21 Tire Comparison Side By Side
  245/30-21 295/25-21 Difference
Diameter inches (mm) 26.79 (680.4) 26.81 (680.9) 0.02 (0.5) 0.1%
Width inches (mm) 9.65 (245) 11.61 (295) 1.97 (50) 20.4%
Circum. inches (mm) 84.16 (2137.54) 84.22 (2139.11) 0.06 (1.57) 0.1%
Sidewall Height inches (mm) 2.89 (73.5) 2.9 (73.75) 0.01 (0.25) 0.3%
Revolutions per mile (km) 752.9 (467.83) 752.34 (467.48) -0.55 (-0.34) -0.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.01 mph (32.21 km/h)
25 mph (40.23 km/h)25.02 mph (40.26 km/h)
30 mph (48.28 km/h)30.02 mph (48.32 km/h)
35 mph (56.33 km/h)35.03 mph (56.37 km/h)
40 mph (64.37 km/h)40.03 mph (64.42 km/h)
45 mph (72.42 km/h)45.03 mph (72.47 km/h)
50 mph (80.47 km/h)50.04 mph (80.53 km/h)
55 mph (88.51 km/h)55.04 mph (88.58 km/h)
60 mph (96.56 km/h)60.04 mph (96.63 km/h)
65 mph (104.61 km/h)65.05 mph (104.68 km/h)
70 mph (112.65 km/h)70.05 mph (112.74 km/h)
75 mph (120.7 km/h)75.06 mph (120.79 km/h)
80 mph (128.75 km/h)80.06 mph (128.84 km/h)
85 mph (136.79 km/h)85.06 mph (136.9 km/h)
90 mph (144.84 km/h)90.07 mph (144.95 km/h)
95 mph (152.89 km/h)95.07 mph (153 km/h)
100 mph (160.93 km/h)100.07 mph (161.05 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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