Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/30r21 vs 295/35r21 Tire Comparison Side By Side
  255/30-21 295/35-21 Difference
Diameter inches (mm) 27.02 (686.4) 29.13 (739.9) 2.11 (53.5) 7.8%
Width inches (mm) 10.04 (255) 11.61 (295) 1.57 (40) 15.7%
Circum. inches (mm) 84.9 (2156.39) 91.51 (2324.46) 6.62 (168.08) 7.8%
Sidewall Height inches (mm) 3.01 (76.5) 4.06 (103.25) 1.05 (26.75) 35%
Revolutions per mile (km) 746.31 (463.74) 692.35 (430.21) -53.96 (-33.53) -7.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.56 mph (34.7 km/h)
25 mph (40.23 km/h)26.95 mph (43.37 km/h)
30 mph (48.28 km/h)32.34 mph (52.04 km/h)
35 mph (56.33 km/h)37.73 mph (60.72 km/h)
40 mph (64.37 km/h)43.12 mph (69.39 km/h)
45 mph (72.42 km/h)48.51 mph (78.07 km/h)
50 mph (80.47 km/h)53.9 mph (86.74 km/h)
55 mph (88.51 km/h)59.29 mph (95.41 km/h)
60 mph (96.56 km/h)64.68 mph (104.09 km/h)
65 mph (104.61 km/h)70.07 mph (112.76 km/h)
70 mph (112.65 km/h)75.46 mph (121.43 km/h)
75 mph (120.7 km/h)80.85 mph (130.11 km/h)
80 mph (128.75 km/h)86.24 mph (138.78 km/h)
85 mph (136.79 km/h)91.63 mph (147.46 km/h)
90 mph (144.84 km/h)97.01 mph (156.13 km/h)
95 mph (152.89 km/h)102.4 mph (164.8 km/h)
100 mph (160.93 km/h)107.79 mph (173.48 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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