Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/50r15 vs 215/60r15 Tire Comparison Side By Side
  255/50-15 215/60-15 Difference
Diameter inches (mm) 25.04 (636) 25.16 (639) 0.12 (3) 0.5%
Width inches (mm) 10.04 (255) 8.46 (215) -1.57 (-40) -15.7%
Circum. inches (mm) 78.66 (1998.05) 79.03 (2007.48) 0.37 (9.42) 0.5%
Sidewall Height inches (mm) 5.02 (127.5) 5.08 (129) 0.06 (1.5) 1.2%
Revolutions per mile (km) 805.46 (500.49) 801.67 (498.14) -3.78 (-2.35) -0.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.09 mph (32.34 km/h)
25 mph (40.23 km/h)25.12 mph (40.42 km/h)
30 mph (48.28 km/h)30.14 mph (48.51 km/h)
35 mph (56.33 km/h)35.17 mph (56.59 km/h)
40 mph (64.37 km/h)40.19 mph (64.68 km/h)
45 mph (72.42 km/h)45.21 mph (72.76 km/h)
50 mph (80.47 km/h)50.24 mph (80.85 km/h)
55 mph (88.51 km/h)55.26 mph (88.93 km/h)
60 mph (96.56 km/h)60.28 mph (97.02 km/h)
65 mph (104.61 km/h)65.31 mph (105.1 km/h)
70 mph (112.65 km/h)70.33 mph (113.19 km/h)
75 mph (120.7 km/h)75.35 mph (121.27 km/h)
80 mph (128.75 km/h)80.38 mph (129.36 km/h)
85 mph (136.79 km/h)85.4 mph (137.44 km/h)
90 mph (144.84 km/h)90.42 mph (145.52 km/h)
95 mph (152.89 km/h)95.45 mph (153.61 km/h)
100 mph (160.93 km/h)100.47 mph (161.69 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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