Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/75r16 vs 175/85r15 Tire Comparison Side By Side
  175/75-16 175/85-15 Difference
Diameter inches (mm) 26.33 (668.9) 26.71 (678.5) 0.38 (9.6) 1.4%
Width inches (mm) 6.89 (175) 6.89 (175) 0 (0) 0%
Circum. inches (mm) 82.73 (2101.41) 83.92 (2131.57) 1.19 (30.16) 1.4%
Sidewall Height inches (mm) 5.17 (131.25) 5.86 (148.75) 0.69 (17.5) 13.3%
Revolutions per mile (km) 765.84 (475.87) 755 (469.14) -10.84 (-6.73) -1.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.29 mph (32.65 km/h)
25 mph (40.23 km/h)25.36 mph (40.81 km/h)
30 mph (48.28 km/h)30.43 mph (48.97 km/h)
35 mph (56.33 km/h)35.5 mph (57.14 km/h)
40 mph (64.37 km/h)40.57 mph (65.3 km/h)
45 mph (72.42 km/h)45.65 mph (73.46 km/h)
50 mph (80.47 km/h)50.72 mph (81.62 km/h)
55 mph (88.51 km/h)55.79 mph (89.78 km/h)
60 mph (96.56 km/h)60.86 mph (97.95 km/h)
65 mph (104.61 km/h)65.93 mph (106.11 km/h)
70 mph (112.65 km/h)71 mph (114.27 km/h)
75 mph (120.7 km/h)76.08 mph (122.43 km/h)
80 mph (128.75 km/h)81.15 mph (130.6 km/h)
85 mph (136.79 km/h)86.22 mph (138.76 km/h)
90 mph (144.84 km/h)91.29 mph (146.92 km/h)
95 mph (152.89 km/h)96.36 mph (155.08 km/h)
100 mph (160.93 km/h)101.44 mph (163.24 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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