Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
295/40r20 vs 245/45r20 Tire Comparison Side By Side
  295/40-20 245/45-20 Difference
Diameter inches (mm) 29.29 (744) 28.68 (728.5) -0.61 (-15.5) -2.1%
Width inches (mm) 11.61 (295) 9.65 (245) -1.97 (-50) -16.9%
Circum. inches (mm) 92.02 (2337.34) 90.1 (2288.65) -1.92 (-48.69) -2.1%
Sidewall Height inches (mm) 4.65 (118) 4.34 (110.25) -0.31 (-7.75) -6.6%
Revolutions per mile (km) 688.54 (427.84) 703.18 (436.94) 14.65 (9.1) 2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.58 mph (31.52 km/h)
25 mph (40.23 km/h)24.48 mph (39.4 km/h)
30 mph (48.28 km/h)29.38 mph (47.27 km/h)
35 mph (56.33 km/h)34.27 mph (55.15 km/h)
40 mph (64.37 km/h)39.17 mph (63.03 km/h)
45 mph (72.42 km/h)44.06 mph (70.91 km/h)
50 mph (80.47 km/h)48.96 mph (78.79 km/h)
55 mph (88.51 km/h)53.85 mph (86.67 km/h)
60 mph (96.56 km/h)58.75 mph (94.55 km/h)
65 mph (104.61 km/h)63.65 mph (102.43 km/h)
70 mph (112.65 km/h)68.54 mph (110.31 km/h)
75 mph (120.7 km/h)73.44 mph (118.19 km/h)
80 mph (128.75 km/h)78.33 mph (126.07 km/h)
85 mph (136.79 km/h)83.23 mph (133.94 km/h)
90 mph (144.84 km/h)88.13 mph (141.82 km/h)
95 mph (152.89 km/h)93.02 mph (149.7 km/h)
100 mph (160.93 km/h)97.92 mph (157.58 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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