Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/65r15 vs 195/65r15 Tire Comparison Side By Side
  205/65-15 195/65-15 Difference
Diameter inches (mm) 25.49 (647.5) 24.98 (634.5) -0.51 (-13) -2%
Width inches (mm) 8.07 (205) 7.68 (195) -0.39 (-10) -4.9%
Circum. inches (mm) 80.09 (2034.18) 78.48 (1993.34) -1.61 (-40.84) -2%
Sidewall Height inches (mm) 5.25 (133.25) 4.99 (126.75) -0.26 (-6.5) -4.9%
Revolutions per mile (km) 791.15 (491.6) 807.36 (501.67) 16.21 (10.07) 2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.6 mph (31.54 km/h)
25 mph (40.23 km/h)24.5 mph (39.43 km/h)
30 mph (48.28 km/h)29.4 mph (47.31 km/h)
35 mph (56.33 km/h)34.3 mph (55.2 km/h)
40 mph (64.37 km/h)39.2 mph (63.08 km/h)
45 mph (72.42 km/h)44.1 mph (70.97 km/h)
50 mph (80.47 km/h)49 mph (78.85 km/h)
55 mph (88.51 km/h)53.9 mph (86.74 km/h)
60 mph (96.56 km/h)58.8 mph (94.62 km/h)
65 mph (104.61 km/h)63.69 mph (102.51 km/h)
70 mph (112.65 km/h)68.59 mph (110.39 km/h)
75 mph (120.7 km/h)73.49 mph (118.28 km/h)
80 mph (128.75 km/h)78.39 mph (126.16 km/h)
85 mph (136.79 km/h)83.29 mph (134.05 km/h)
90 mph (144.84 km/h)88.19 mph (141.93 km/h)
95 mph (152.89 km/h)93.09 mph (149.82 km/h)
100 mph (160.93 km/h)97.99 mph (157.7 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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