Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/45r15 vs 195/45r15 Tire Comparison Side By Side
  175/45-15 195/45-15 Difference
Diameter inches (mm) 21.2 (538.5) 21.91 (556.5) 0.71 (18) 3.3%
Width inches (mm) 6.89 (175) 7.68 (195) 0.79 (20) 11.4%
Circum. inches (mm) 66.6 (1691.75) 68.83 (1748.3) 2.23 (56.55) 3.3%
Sidewall Height inches (mm) 3.1 (78.75) 3.45 (87.75) 0.35 (9) 11.4%
Revolutions per mile (km) 951.29 (591.1) 920.52 (571.98) -30.77 (-19.12) -3.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.67 mph (33.26 km/h)
25 mph (40.23 km/h)25.84 mph (41.58 km/h)
30 mph (48.28 km/h)31 mph (49.89 km/h)
35 mph (56.33 km/h)36.17 mph (58.21 km/h)
40 mph (64.37 km/h)41.34 mph (66.53 km/h)
45 mph (72.42 km/h)46.5 mph (74.84 km/h)
50 mph (80.47 km/h)51.67 mph (83.16 km/h)
55 mph (88.51 km/h)56.84 mph (91.47 km/h)
60 mph (96.56 km/h)62.01 mph (99.79 km/h)
65 mph (104.61 km/h)67.17 mph (108.1 km/h)
70 mph (112.65 km/h)72.34 mph (116.42 km/h)
75 mph (120.7 km/h)77.51 mph (124.74 km/h)
80 mph (128.75 km/h)82.67 mph (133.05 km/h)
85 mph (136.79 km/h)87.84 mph (141.37 km/h)
90 mph (144.84 km/h)93.01 mph (149.68 km/h)
95 mph (152.89 km/h)98.18 mph (158 km/h)
100 mph (160.93 km/h)103.34 mph (166.31 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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