Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
215/50r15 vs 195/60r15 Tire Comparison Side By Side
  215/50-15 195/60-15 Difference
Diameter inches (mm) 23.46 (596) 24.21 (615) 0.75 (19) 3.2%
Width inches (mm) 8.46 (215) 7.68 (195) -0.79 (-20) -9.3%
Circum. inches (mm) 73.72 (1872.39) 76.07 (1932.08) 2.35 (59.69) 3.2%
Sidewall Height inches (mm) 4.23 (107.5) 4.61 (117) 0.37 (9.5) 8.8%
Revolutions per mile (km) 859.51 (534.08) 832.96 (517.58) -26.55 (-16.5) -3.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.64 mph (33.21 km/h)
25 mph (40.23 km/h)25.8 mph (41.52 km/h)
30 mph (48.28 km/h)30.96 mph (49.82 km/h)
35 mph (56.33 km/h)36.12 mph (58.12 km/h)
40 mph (64.37 km/h)41.28 mph (66.43 km/h)
45 mph (72.42 km/h)46.43 mph (74.73 km/h)
50 mph (80.47 km/h)51.59 mph (83.03 km/h)
55 mph (88.51 km/h)56.75 mph (91.34 km/h)
60 mph (96.56 km/h)61.91 mph (99.64 km/h)
65 mph (104.61 km/h)67.07 mph (107.94 km/h)
70 mph (112.65 km/h)72.23 mph (116.25 km/h)
75 mph (120.7 km/h)77.39 mph (124.55 km/h)
80 mph (128.75 km/h)82.55 mph (132.85 km/h)
85 mph (136.79 km/h)87.71 mph (141.16 km/h)
90 mph (144.84 km/h)92.87 mph (149.46 km/h)
95 mph (152.89 km/h)98.03 mph (157.76 km/h)
100 mph (160.93 km/h)103.19 mph (166.07 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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