Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/90r15 vs 135/80r17 Tire Comparison Side By Side
  135/90-15 135/80-17 Difference
Diameter inches (mm) 24.57 (624) 25.5 (647.8) 0.94 (23.8) 3.8%
Width inches (mm) 5.31 (135) 5.31 (135) 0 (0) 0%
Circum. inches (mm) 77.18 (1960.35) 80.12 (2035.12) 2.94 (74.77) 3.8%
Sidewall Height inches (mm) 4.78 (121.5) 4.25 (108) -0.53 (-13.5) -11.1%
Revolutions per mile (km) 820.95 (510.11) 790.78 (491.37) -30.16 (-18.74) -3.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.76 mph (33.41 km/h)
25 mph (40.23 km/h)25.95 mph (41.77 km/h)
30 mph (48.28 km/h)31.14 mph (50.12 km/h)
35 mph (56.33 km/h)36.33 mph (58.48 km/h)
40 mph (64.37 km/h)41.53 mph (66.83 km/h)
45 mph (72.42 km/h)46.72 mph (75.18 km/h)
50 mph (80.47 km/h)51.91 mph (83.54 km/h)
55 mph (88.51 km/h)57.1 mph (91.89 km/h)
60 mph (96.56 km/h)62.29 mph (100.24 km/h)
65 mph (104.61 km/h)67.48 mph (108.6 km/h)
70 mph (112.65 km/h)72.67 mph (116.95 km/h)
75 mph (120.7 km/h)77.86 mph (125.3 km/h)
80 mph (128.75 km/h)83.05 mph (133.66 km/h)
85 mph (136.79 km/h)88.24 mph (142.01 km/h)
90 mph (144.84 km/h)93.43 mph (150.37 km/h)
95 mph (152.89 km/h)98.62 mph (158.72 km/h)
100 mph (160.93 km/h)103.81 mph (167.07 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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