Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
196/65r15 vs 235/60r15 Tire Comparison Side By Side
  196/65-15 235/60-15 Difference
Diameter inches (mm) 25.03 (635.8) 26.1 (663) 1.07 (27.2) 4.3%
Width inches (mm) 7.72 (196) 9.25 (235) 1.54 (39) 19.9%
Circum. inches (mm) 78.64 (1997.42) 82 (2082.88) 3.36 (85.45) 4.3%
Sidewall Height inches (mm) 5.02 (127.4) 5.55 (141) 0.54 (13.6) 10.7%
Revolutions per mile (km) 805.71 (500.64) 772.65 (480.1) -33.05 (-20.54) -4.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.86 mph (33.56 km/h)
25 mph (40.23 km/h)26.07 mph (41.95 km/h)
30 mph (48.28 km/h)31.28 mph (50.35 km/h)
35 mph (56.33 km/h)36.5 mph (58.74 km/h)
40 mph (64.37 km/h)41.71 mph (67.13 km/h)
45 mph (72.42 km/h)46.93 mph (75.52 km/h)
50 mph (80.47 km/h)52.14 mph (83.91 km/h)
55 mph (88.51 km/h)57.35 mph (92.3 km/h)
60 mph (96.56 km/h)62.57 mph (100.69 km/h)
65 mph (104.61 km/h)67.78 mph (109.08 km/h)
70 mph (112.65 km/h)72.99 mph (117.47 km/h)
75 mph (120.7 km/h)78.21 mph (125.86 km/h)
80 mph (128.75 km/h)83.42 mph (134.26 km/h)
85 mph (136.79 km/h)88.64 mph (142.65 km/h)
90 mph (144.84 km/h)93.85 mph (151.04 km/h)
95 mph (152.89 km/h)99.06 mph (159.43 km/h)
100 mph (160.93 km/h)104.28 mph (167.82 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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