Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/75r15 vs 235/70r15 Tire Comparison Side By Side
  215/75-15 235/70-15 Difference
Diameter inches (mm) 27.7 (703.5) 27.95 (710) 0.26 (6.5) 0.9%
Width inches (mm) 8.46 (215) 9.25 (235) 0.79 (20) 9.3%
Circum. inches (mm) 87.01 (2210.11) 87.82 (2230.53) 0.8 (20.42) 0.9%
Sidewall Height inches (mm) 6.35 (161.25) 6.48 (164.5) 0.13 (3.25) 2%
Revolutions per mile (km) 728.17 (452.47) 721.51 (448.32) -6.67 (-4.14) -0.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.18 mph (32.48 km/h)
25 mph (40.23 km/h)25.23 mph (40.61 km/h)
30 mph (48.28 km/h)30.28 mph (48.73 km/h)
35 mph (56.33 km/h)35.32 mph (56.85 km/h)
40 mph (64.37 km/h)40.37 mph (64.97 km/h)
45 mph (72.42 km/h)45.42 mph (73.09 km/h)
50 mph (80.47 km/h)50.46 mph (81.21 km/h)
55 mph (88.51 km/h)55.51 mph (89.33 km/h)
60 mph (96.56 km/h)60.55 mph (97.45 km/h)
65 mph (104.61 km/h)65.6 mph (105.57 km/h)
70 mph (112.65 km/h)70.65 mph (113.7 km/h)
75 mph (120.7 km/h)75.69 mph (121.82 km/h)
80 mph (128.75 km/h)80.74 mph (129.94 km/h)
85 mph (136.79 km/h)85.79 mph (138.06 km/h)
90 mph (144.84 km/h)90.83 mph (146.18 km/h)
95 mph (152.89 km/h)95.88 mph (154.3 km/h)
100 mph (160.93 km/h)100.92 mph (162.42 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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