Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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/ R
185/65r15 vs 195/60r15 Tire Comparison Side By Side
  185/65-15 195/60-15 Difference
Diameter inches (mm) 24.47 (621.5) 24.21 (615) -0.26 (-6.5) -1%
Width inches (mm) 7.28 (185) 7.68 (195) 0.39 (10) 5.4%
Circum. inches (mm) 76.87 (1952.5) 76.07 (1932.08) -0.8 (-20.42) -1%
Sidewall Height inches (mm) 4.73 (120.25) 4.61 (117) -0.13 (-3.25) -2.7%
Revolutions per mile (km) 824.25 (512.16) 832.96 (517.58) 8.71 (5.41) 1.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.79 mph (31.85 km/h)
25 mph (40.23 km/h)24.74 mph (39.81 km/h)
30 mph (48.28 km/h)29.69 mph (47.78 km/h)
35 mph (56.33 km/h)34.63 mph (55.74 km/h)
40 mph (64.37 km/h)39.58 mph (63.7 km/h)
45 mph (72.42 km/h)44.53 mph (71.66 km/h)
50 mph (80.47 km/h)49.48 mph (79.63 km/h)
55 mph (88.51 km/h)54.42 mph (87.59 km/h)
60 mph (96.56 km/h)59.37 mph (95.55 km/h)
65 mph (104.61 km/h)64.32 mph (103.51 km/h)
70 mph (112.65 km/h)69.27 mph (111.48 km/h)
75 mph (120.7 km/h)74.22 mph (119.44 km/h)
80 mph (128.75 km/h)79.16 mph (127.4 km/h)
85 mph (136.79 km/h)84.11 mph (135.36 km/h)
90 mph (144.84 km/h)89.06 mph (143.33 km/h)
95 mph (152.89 km/h)94.01 mph (151.29 km/h)
100 mph (160.93 km/h)98.95 mph (159.25 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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