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 225/65r17 Tire Comparison Side By Side
  165/90-17 225/65-17 Difference
Diameter inches (mm) 28.69 (728.8) 28.52 (724.3) -0.18 (-4.5) -0.6%
Width inches (mm) 6.5 (165) 8.86 (225) 2.36 (60) 36.4%
Circum. inches (mm) 90.14 (2289.59) 89.58 (2275.46) -0.56 (-14.14) -0.6%
Sidewall Height inches (mm) 5.85 (148.5) 5.76 (146.25) -0.09 (-2.25) -1.5%
Revolutions per mile (km) 702.9 (436.76) 707.26 (439.47) 4.37 (2.71) 0.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.88 mph (31.99 km/h)
25 mph (40.23 km/h)24.85 mph (39.99 km/h)
30 mph (48.28 km/h)29.81 mph (47.98 km/h)
35 mph (56.33 km/h)34.78 mph (55.98 km/h)
40 mph (64.37 km/h)39.75 mph (63.98 km/h)
45 mph (72.42 km/h)44.72 mph (71.97 km/h)
50 mph (80.47 km/h)49.69 mph (79.97 km/h)
55 mph (88.51 km/h)54.66 mph (87.97 km/h)
60 mph (96.56 km/h)59.63 mph (95.96 km/h)
65 mph (104.61 km/h)64.6 mph (103.96 km/h)
70 mph (112.65 km/h)69.57 mph (111.96 km/h)
75 mph (120.7 km/h)74.54 mph (119.96 km/h)
80 mph (128.75 km/h)79.51 mph (127.95 km/h)
85 mph (136.79 km/h)84.48 mph (135.95 km/h)
90 mph (144.84 km/h)89.44 mph (143.95 km/h)
95 mph (152.89 km/h)94.41 mph (151.94 km/h)
100 mph (160.93 km/h)99.38 mph (159.94 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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