Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
110/70r17 vs 120/90r17 Tire Comparison Side By Side
  110/70-17 120/90-17 Difference
Diameter inches (mm) 23.06 (585.8) 25.5 (647.8) 2.44 (62) 10.6%
Width inches (mm) 4.33 (110) 4.72 (120) 0.39 (10) 9.1%
Circum. inches (mm) 72.45 (1840.34) 80.12 (2035.12) 7.67 (194.78) 10.6%
Sidewall Height inches (mm) 3.03 (77) 4.25 (108) 1.22 (31) 40.3%
Revolutions per mile (km) 874.48 (543.38) 790.78 (491.37) -83.7 (-52.01) -9.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.12 mph (35.59 km/h)
25 mph (40.23 km/h)27.65 mph (44.49 km/h)
30 mph (48.28 km/h)33.18 mph (53.39 km/h)
35 mph (56.33 km/h)38.7 mph (62.29 km/h)
40 mph (64.37 km/h)44.23 mph (71.19 km/h)
45 mph (72.42 km/h)49.76 mph (80.09 km/h)
50 mph (80.47 km/h)55.29 mph (88.98 km/h)
55 mph (88.51 km/h)60.82 mph (97.88 km/h)
60 mph (96.56 km/h)66.35 mph (106.78 km/h)
65 mph (104.61 km/h)71.88 mph (115.68 km/h)
70 mph (112.65 km/h)77.41 mph (124.58 km/h)
75 mph (120.7 km/h)82.94 mph (133.48 km/h)
80 mph (128.75 km/h)88.47 mph (142.37 km/h)
85 mph (136.79 km/h)94 mph (151.27 km/h)
90 mph (144.84 km/h)99.53 mph (160.17 km/h)
95 mph (152.89 km/h)105.05 mph (169.07 km/h)
100 mph (160.93 km/h)110.58 mph (177.97 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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