Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
160/60r15 vs 175/65r15 Tire Comparison Side By Side
  160/60-15 175/65-15 Difference
Diameter inches (mm) 22.56 (573) 23.96 (608.5) 1.4 (35.5) 6.2%
Width inches (mm) 6.3 (160) 6.89 (175) 0.59 (15) 9.4%
Circum. inches (mm) 70.87 (1800.13) 75.26 (1911.66) 4.39 (111.53) 6.2%
Sidewall Height inches (mm) 3.78 (96) 4.48 (113.75) 0.7 (17.75) 18.5%
Revolutions per mile (km) 894.01 (555.51) 841.86 (523.1) -52.16 (-32.41) -5.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.24 mph (34.18 km/h)
25 mph (40.23 km/h)26.55 mph (42.73 km/h)
30 mph (48.28 km/h)31.86 mph (51.27 km/h)
35 mph (56.33 km/h)37.17 mph (59.82 km/h)
40 mph (64.37 km/h)42.48 mph (68.36 km/h)
45 mph (72.42 km/h)47.79 mph (76.91 km/h)
50 mph (80.47 km/h)53.1 mph (85.45 km/h)
55 mph (88.51 km/h)58.41 mph (94 km/h)
60 mph (96.56 km/h)63.72 mph (102.54 km/h)
65 mph (104.61 km/h)69.03 mph (111.09 km/h)
70 mph (112.65 km/h)74.34 mph (119.63 km/h)
75 mph (120.7 km/h)79.65 mph (128.18 km/h)
80 mph (128.75 km/h)84.96 mph (136.72 km/h)
85 mph (136.79 km/h)90.27 mph (145.27 km/h)
90 mph (144.84 km/h)95.58 mph (153.81 km/h)
95 mph (152.89 km/h)100.89 mph (162.36 km/h)
100 mph (160.93 km/h)106.2 mph (170.91 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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