Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/45r15 vs 260/60r15 Tire Comparison Side By Side
  215/45-15 260/60-15 Difference
Diameter inches (mm) 22.62 (574.5) 27.28 (693) 4.67 (118.5) 20.6%
Width inches (mm) 8.46 (215) 10.24 (260) 1.77 (45) 20.9%
Circum. inches (mm) 71.06 (1804.84) 85.71 (2177.12) 14.66 (372.28) 20.6%
Sidewall Height inches (mm) 3.81 (96.75) 6.14 (156) 2.33 (59.25) 61.2%
Revolutions per mile (km) 891.68 (554.06) 739.21 (459.32) -152.47 (-94.74) -17.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)24.13 mph (38.83 km/h)
25 mph (40.23 km/h)30.16 mph (48.53 km/h)
30 mph (48.28 km/h)36.19 mph (58.24 km/h)
35 mph (56.33 km/h)42.22 mph (67.95 km/h)
40 mph (64.37 km/h)48.25 mph (77.65 km/h)
45 mph (72.42 km/h)54.28 mph (87.36 km/h)
50 mph (80.47 km/h)60.31 mph (97.07 km/h)
55 mph (88.51 km/h)66.34 mph (106.77 km/h)
60 mph (96.56 km/h)72.38 mph (116.48 km/h)
65 mph (104.61 km/h)78.41 mph (126.18 km/h)
70 mph (112.65 km/h)84.44 mph (135.89 km/h)
75 mph (120.7 km/h)90.47 mph (145.6 km/h)
80 mph (128.75 km/h)96.5 mph (155.3 km/h)
85 mph (136.79 km/h)102.53 mph (165.01 km/h)
90 mph (144.84 km/h)108.56 mph (174.72 km/h)
95 mph (152.89 km/h)114.6 mph (184.42 km/h)
100 mph (160.93 km/h)120.63 mph (194.13 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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