Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
275/35r21 vs 275/30r21 Tire Comparison Side By Side
  275/35-21 275/30-21 Difference
Diameter inches (mm) 28.58 (725.9) 27.5 (698.4) -1.08 (-27.5) -3.8%
Width inches (mm) 10.83 (275) 10.83 (275) 0 (0) 0%
Circum. inches (mm) 89.78 (2280.48) 86.38 (2194.09) -3.4 (-86.39) -3.8%
Sidewall Height inches (mm) 3.79 (96.25) 3.25 (82.5) -0.54 (-13.75) -14.3%
Revolutions per mile (km) 705.7 (438.5) 733.49 (455.77) 27.79 (17.27) 3.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.24 mph (30.97 km/h)
25 mph (40.23 km/h)24.05 mph (38.71 km/h)
30 mph (48.28 km/h)28.86 mph (46.45 km/h)
35 mph (56.33 km/h)33.67 mph (54.19 km/h)
40 mph (64.37 km/h)38.48 mph (61.94 km/h)
45 mph (72.42 km/h)43.3 mph (69.68 km/h)
50 mph (80.47 km/h)48.11 mph (77.42 km/h)
55 mph (88.51 km/h)52.92 mph (85.16 km/h)
60 mph (96.56 km/h)57.73 mph (92.9 km/h)
65 mph (104.61 km/h)62.54 mph (100.64 km/h)
70 mph (112.65 km/h)67.35 mph (108.39 km/h)
75 mph (120.7 km/h)72.16 mph (116.13 km/h)
80 mph (128.75 km/h)76.97 mph (123.87 km/h)
85 mph (136.79 km/h)81.78 mph (131.61 km/h)
90 mph (144.84 km/h)86.59 mph (139.35 km/h)
95 mph (152.89 km/h)91.4 mph (147.1 km/h)
100 mph (160.93 km/h)96.21 mph (154.84 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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