Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/80r18 vs 215/55r18 Tire Comparison Side By Side
  135/80-18 215/55-18 Difference
Diameter inches (mm) 26.5 (673.2) 27.31 (693.7) 0.81 (20.5) 3%
Width inches (mm) 5.31 (135) 8.46 (215) 3.15 (80) 59.3%
Circum. inches (mm) 83.26 (2114.92) 85.8 (2179.32) 2.54 (64.4) 3%
Sidewall Height inches (mm) 4.25 (108) 4.66 (118.25) 0.4 (10.25) 9.5%
Revolutions per mile (km) 760.95 (472.83) 738.46 (458.86) -22.49 (-13.97) -3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.61 mph (33.17 km/h)
25 mph (40.23 km/h)25.76 mph (41.46 km/h)
30 mph (48.28 km/h)30.91 mph (49.75 km/h)
35 mph (56.33 km/h)36.07 mph (58.04 km/h)
40 mph (64.37 km/h)41.22 mph (66.33 km/h)
45 mph (72.42 km/h)46.37 mph (74.63 km/h)
50 mph (80.47 km/h)51.52 mph (82.92 km/h)
55 mph (88.51 km/h)56.67 mph (91.21 km/h)
60 mph (96.56 km/h)61.83 mph (99.5 km/h)
65 mph (104.61 km/h)66.98 mph (107.79 km/h)
70 mph (112.65 km/h)72.13 mph (116.08 km/h)
75 mph (120.7 km/h)77.28 mph (124.38 km/h)
80 mph (128.75 km/h)82.44 mph (132.67 km/h)
85 mph (136.79 km/h)87.59 mph (140.96 km/h)
90 mph (144.84 km/h)92.74 mph (149.25 km/h)
95 mph (152.89 km/h)97.89 mph (157.54 km/h)
100 mph (160.93 km/h)103.05 mph (165.84 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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