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 165/65r14 Tire Comparison Side By Side
  195/50-15 165/65-14 Difference
Diameter inches (mm) 22.68 (576) 22.44 (570.1) -0.23 (-5.9) -1%
Width inches (mm) 7.68 (195) 6.5 (165) -1.18 (-30) -15.4%
Circum. inches (mm) 71.24 (1809.56) 70.51 (1791.02) -0.73 (-18.54) -1%
Sidewall Height inches (mm) 3.84 (97.5) 4.22 (107.25) 0.38 (9.75) 10%
Revolutions per mile (km) 889.36 (552.62) 898.56 (558.34) 9.2 (5.72) 1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.8 mph (31.86 km/h)
25 mph (40.23 km/h)24.74 mph (39.82 km/h)
30 mph (48.28 km/h)29.69 mph (47.79 km/h)
35 mph (56.33 km/h)34.64 mph (55.75 km/h)
40 mph (64.37 km/h)39.59 mph (63.71 km/h)
45 mph (72.42 km/h)44.54 mph (71.68 km/h)
50 mph (80.47 km/h)49.49 mph (79.64 km/h)
55 mph (88.51 km/h)54.44 mph (87.61 km/h)
60 mph (96.56 km/h)59.39 mph (95.57 km/h)
65 mph (104.61 km/h)64.33 mph (103.54 km/h)
70 mph (112.65 km/h)69.28 mph (111.5 km/h)
75 mph (120.7 km/h)74.23 mph (119.46 km/h)
80 mph (128.75 km/h)79.18 mph (127.43 km/h)
85 mph (136.79 km/h)84.13 mph (135.39 km/h)
90 mph (144.84 km/h)89.08 mph (143.36 km/h)
95 mph (152.89 km/h)94.03 mph (151.32 km/h)
100 mph (160.93 km/h)98.98 mph (159.29 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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