Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
110/70r12 vs 100/80r12 Tire Comparison Side By Side
  110/70-12 100/80-12 Difference
Diameter inches (mm) 18.06 (458.8) 18.3 (464.8) 0.24 (6) 1.3%
Width inches (mm) 4.33 (110) 3.94 (100) -0.39 (-10) -9.1%
Circum. inches (mm) 56.75 (1441.36) 57.49 (1460.21) 0.74 (18.85) 1.3%
Sidewall Height inches (mm) 3.03 (77) 3.15 (80) 0.12 (3) 3.9%
Revolutions per mile (km) 1116.54 (693.79) 1102.13 (684.83) -14.41 (-8.96) -1.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.26 mph (32.61 km/h)
25 mph (40.23 km/h)25.33 mph (40.76 km/h)
30 mph (48.28 km/h)30.39 mph (48.91 km/h)
35 mph (56.33 km/h)35.46 mph (57.06 km/h)
40 mph (64.37 km/h)40.52 mph (65.22 km/h)
45 mph (72.42 km/h)45.59 mph (73.37 km/h)
50 mph (80.47 km/h)50.65 mph (81.52 km/h)
55 mph (88.51 km/h)55.72 mph (89.67 km/h)
60 mph (96.56 km/h)60.78 mph (97.82 km/h)
65 mph (104.61 km/h)65.85 mph (105.98 km/h)
70 mph (112.65 km/h)70.92 mph (114.13 km/h)
75 mph (120.7 km/h)75.98 mph (122.28 km/h)
80 mph (128.75 km/h)81.05 mph (130.43 km/h)
85 mph (136.79 km/h)86.11 mph (138.58 km/h)
90 mph (144.84 km/h)91.18 mph (146.74 km/h)
95 mph (152.89 km/h)96.24 mph (154.89 km/h)
100 mph (160.93 km/h)101.31 mph (163.04 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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