Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/30r20 vs 295/65r20 Tire Comparison Side By Side
  215/30-20 295/65-20 Difference
Diameter inches (mm) 25.08 (637) 35.1 (891.5) 10.02 (254.5) 40%
Width inches (mm) 8.46 (215) 11.61 (295) 3.15 (80) 37.2%
Circum. inches (mm) 78.79 (2001.19) 110.26 (2800.73) 31.48 (799.54) 40%
Sidewall Height inches (mm) 2.54 (64.5) 7.55 (191.75) 5.01 (127.25) 197.3%
Revolutions per mile (km) 804.19 (499.7) 574.62 (357.05) -229.58 (-142.65) -28.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)27.99 mph (45.05 km/h)
25 mph (40.23 km/h)34.99 mph (56.31 km/h)
30 mph (48.28 km/h)41.99 mph (67.57 km/h)
35 mph (56.33 km/h)48.98 mph (78.83 km/h)
40 mph (64.37 km/h)55.98 mph (90.09 km/h)
45 mph (72.42 km/h)62.98 mph (101.35 km/h)
50 mph (80.47 km/h)69.98 mph (112.62 km/h)
55 mph (88.51 km/h)76.97 mph (123.88 km/h)
60 mph (96.56 km/h)83.97 mph (135.14 km/h)
65 mph (104.61 km/h)90.97 mph (146.4 km/h)
70 mph (112.65 km/h)97.97 mph (157.66 km/h)
75 mph (120.7 km/h)104.96 mph (168.92 km/h)
80 mph (128.75 km/h)111.96 mph (180.19 km/h)
85 mph (136.79 km/h)118.96 mph (191.45 km/h)
90 mph (144.84 km/h)125.96 mph (202.71 km/h)
95 mph (152.89 km/h)132.96 mph (213.97 km/h)
100 mph (160.93 km/h)139.95 mph (225.23 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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