Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/90r16 vs 215/55r17 Tire Comparison Side By Side
  135/90-16 215/55-17 Difference
Diameter inches (mm) 25.57 (649.4) 26.31 (668.3) 0.74 (18.9) 2.9%
Width inches (mm) 5.31 (135) 8.46 (215) 3.15 (80) 59.3%
Circum. inches (mm) 80.32 (2040.15) 82.66 (2099.53) 2.34 (59.38) 2.9%
Sidewall Height inches (mm) 4.78 (121.5) 4.66 (118.25) -0.13 (-3.25) -2.7%
Revolutions per mile (km) 788.84 (490.16) 766.53 (476.3) -22.31 (-13.86) -2.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.58 mph (33.12 km/h)
25 mph (40.23 km/h)25.73 mph (41.4 km/h)
30 mph (48.28 km/h)30.87 mph (49.69 km/h)
35 mph (56.33 km/h)36.02 mph (57.97 km/h)
40 mph (64.37 km/h)41.16 mph (66.25 km/h)
45 mph (72.42 km/h)46.31 mph (74.53 km/h)
50 mph (80.47 km/h)51.46 mph (82.81 km/h)
55 mph (88.51 km/h)56.6 mph (91.09 km/h)
60 mph (96.56 km/h)61.75 mph (99.37 km/h)
65 mph (104.61 km/h)66.89 mph (107.65 km/h)
70 mph (112.65 km/h)72.04 mph (115.93 km/h)
75 mph (120.7 km/h)77.18 mph (124.21 km/h)
80 mph (128.75 km/h)82.33 mph (132.49 km/h)
85 mph (136.79 km/h)87.47 mph (140.78 km/h)
90 mph (144.84 km/h)92.62 mph (149.06 km/h)
95 mph (152.89 km/h)97.76 mph (157.34 km/h)
100 mph (160.93 km/h)102.91 mph (165.62 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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