Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
195/50r15 vs 215/50r15 Tire Comparison Side By Side
  195/50-15 215/50-15 Difference
Diameter inches (mm) 22.68 (576) 23.46 (596) 0.79 (20) 3.5%
Width inches (mm) 7.68 (195) 8.46 (215) 0.79 (20) 10.3%
Circum. inches (mm) 71.24 (1809.56) 73.72 (1872.39) 2.47 (62.83) 3.5%
Sidewall Height inches (mm) 3.84 (97.5) 4.23 (107.5) 0.39 (10) 10.3%
Revolutions per mile (km) 889.36 (552.62) 859.51 (534.08) -29.84 (-18.54) -3.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.69 mph (33.3 km/h)
25 mph (40.23 km/h)25.87 mph (41.63 km/h)
30 mph (48.28 km/h)31.04 mph (49.96 km/h)
35 mph (56.33 km/h)36.22 mph (58.28 km/h)
40 mph (64.37 km/h)41.39 mph (66.61 km/h)
45 mph (72.42 km/h)46.56 mph (74.94 km/h)
50 mph (80.47 km/h)51.74 mph (83.26 km/h)
55 mph (88.51 km/h)56.91 mph (91.59 km/h)
60 mph (96.56 km/h)62.08 mph (99.91 km/h)
65 mph (104.61 km/h)67.26 mph (108.24 km/h)
70 mph (112.65 km/h)72.43 mph (116.57 km/h)
75 mph (120.7 km/h)77.6 mph (124.89 km/h)
80 mph (128.75 km/h)82.78 mph (133.22 km/h)
85 mph (136.79 km/h)87.95 mph (141.54 km/h)
90 mph (144.84 km/h)93.13 mph (149.87 km/h)
95 mph (152.89 km/h)98.3 mph (158.2 km/h)
100 mph (160.93 km/h)103.47 mph (166.52 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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