Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
245/40r20 vs 295/35r20 Tire Comparison Side By Side
  245/40-20 295/35-20 Difference
Diameter inches (mm) 27.72 (704) 28.13 (714.5) 0.41 (10.5) 1.5%
Width inches (mm) 9.65 (245) 11.61 (295) 1.97 (50) 20.4%
Circum. inches (mm) 87.07 (2211.68) 88.37 (2244.67) 1.3 (32.99) 1.5%
Sidewall Height inches (mm) 3.86 (98) 4.06 (103.25) 0.21 (5.25) 5.4%
Revolutions per mile (km) 727.66 (452.14) 716.96 (445.5) -10.69 (-6.64) -1.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.3 mph (32.67 km/h)
25 mph (40.23 km/h)25.37 mph (40.83 km/h)
30 mph (48.28 km/h)30.45 mph (49 km/h)
35 mph (56.33 km/h)35.52 mph (57.17 km/h)
40 mph (64.37 km/h)40.6 mph (65.33 km/h)
45 mph (72.42 km/h)45.67 mph (73.5 km/h)
50 mph (80.47 km/h)50.75 mph (81.67 km/h)
55 mph (88.51 km/h)55.82 mph (89.83 km/h)
60 mph (96.56 km/h)60.89 mph (98 km/h)
65 mph (104.61 km/h)65.97 mph (106.17 km/h)
70 mph (112.65 km/h)71.04 mph (114.33 km/h)
75 mph (120.7 km/h)76.12 mph (122.5 km/h)
80 mph (128.75 km/h)81.19 mph (130.67 km/h)
85 mph (136.79 km/h)86.27 mph (138.83 km/h)
90 mph (144.84 km/h)91.34 mph (147 km/h)
95 mph (152.89 km/h)96.42 mph (155.17 km/h)
100 mph (160.93 km/h)101.49 mph (163.34 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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