Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
165/90r17 vs 165/70r17 Tire Comparison Side By Side
  165/90-17 165/70-17 Difference
Diameter inches (mm) 28.69 (728.8) 26.09 (662.8) -2.6 (-66) -9.1%
Width inches (mm) 6.5 (165) 6.5 (165) 0 (0) 0%
Circum. inches (mm) 90.14 (2289.59) 81.98 (2082.25) -8.16 (-207.35) -9.1%
Sidewall Height inches (mm) 5.85 (148.5) 4.55 (115.5) -1.3 (-33) -22.2%
Revolutions per mile (km) 702.9 (436.76) 772.89 (480.25) 69.99 (43.49) 10%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.19 mph (29.27 km/h)
25 mph (40.23 km/h)22.74 mph (36.59 km/h)
30 mph (48.28 km/h)27.28 mph (43.91 km/h)
35 mph (56.33 km/h)31.83 mph (51.23 km/h)
40 mph (64.37 km/h)36.38 mph (58.54 km/h)
45 mph (72.42 km/h)40.92 mph (65.86 km/h)
50 mph (80.47 km/h)45.47 mph (73.18 km/h)
55 mph (88.51 km/h)50.02 mph (80.5 km/h)
60 mph (96.56 km/h)54.57 mph (87.82 km/h)
65 mph (104.61 km/h)59.11 mph (95.13 km/h)
70 mph (112.65 km/h)63.66 mph (102.45 km/h)
75 mph (120.7 km/h)68.21 mph (109.77 km/h)
80 mph (128.75 km/h)72.76 mph (117.09 km/h)
85 mph (136.79 km/h)77.3 mph (124.41 km/h)
90 mph (144.84 km/h)81.85 mph (131.72 km/h)
95 mph (152.89 km/h)86.4 mph (139.04 km/h)
100 mph (160.93 km/h)90.94 mph (146.36 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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