Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/70r15 vs 195/65r15 Tire Comparison Side By Side
  135/70-15 195/65-15 Difference
Diameter inches (mm) 22.44 (570) 24.98 (634.5) 2.54 (64.5) 11.3%
Width inches (mm) 5.31 (135) 7.68 (195) 2.36 (60) 44.4%
Circum. inches (mm) 70.5 (1790.71) 78.48 (1993.34) 7.98 (202.63) 11.3%
Sidewall Height inches (mm) 3.72 (94.5) 4.99 (126.75) 1.27 (32.25) 34.1%
Revolutions per mile (km) 898.72 (558.44) 807.36 (501.67) -91.36 (-56.77) -10.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.26 mph (35.83 km/h)
25 mph (40.23 km/h)27.83 mph (44.79 km/h)
30 mph (48.28 km/h)33.39 mph (53.74 km/h)
35 mph (56.33 km/h)38.96 mph (62.7 km/h)
40 mph (64.37 km/h)44.53 mph (71.66 km/h)
45 mph (72.42 km/h)50.09 mph (80.62 km/h)
50 mph (80.47 km/h)55.66 mph (89.57 km/h)
55 mph (88.51 km/h)61.22 mph (98.53 km/h)
60 mph (96.56 km/h)66.79 mph (107.49 km/h)
65 mph (104.61 km/h)72.36 mph (116.44 km/h)
70 mph (112.65 km/h)77.92 mph (125.4 km/h)
75 mph (120.7 km/h)83.49 mph (134.36 km/h)
80 mph (128.75 km/h)89.05 mph (143.32 km/h)
85 mph (136.79 km/h)94.62 mph (152.27 km/h)
90 mph (144.84 km/h)100.18 mph (161.23 km/h)
95 mph (152.89 km/h)105.75 mph (170.19 km/h)
100 mph (160.93 km/h)111.32 mph (179.15 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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