Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/70r13 vs 125/80r13 Tire Comparison Side By Side
  135/70-13 125/80-13 Difference
Diameter inches (mm) 20.44 (519.2) 20.87 (530.2) 0.43 (11) 2.1%
Width inches (mm) 5.31 (135) 4.92 (125) -0.39 (-10) -7.4%
Circum. inches (mm) 64.22 (1631.11) 65.58 (1665.67) 1.36 (34.56) 2.1%
Sidewall Height inches (mm) 3.72 (94.5) 3.94 (100) 0.22 (5.5) 5.8%
Revolutions per mile (km) 986.65 (613.08) 966.18 (600.36) -20.47 (-12.72) -2.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.42 mph (32.87 km/h)
25 mph (40.23 km/h)25.53 mph (41.09 km/h)
30 mph (48.28 km/h)30.64 mph (49.3 km/h)
35 mph (56.33 km/h)35.74 mph (57.52 km/h)
40 mph (64.37 km/h)40.85 mph (65.74 km/h)
45 mph (72.42 km/h)45.95 mph (73.95 km/h)
50 mph (80.47 km/h)51.06 mph (82.17 km/h)
55 mph (88.51 km/h)56.17 mph (90.39 km/h)
60 mph (96.56 km/h)61.27 mph (98.61 km/h)
65 mph (104.61 km/h)66.38 mph (106.82 km/h)
70 mph (112.65 km/h)71.48 mph (115.04 km/h)
75 mph (120.7 km/h)76.59 mph (123.26 km/h)
80 mph (128.75 km/h)81.69 mph (131.48 km/h)
85 mph (136.79 km/h)86.8 mph (139.69 km/h)
90 mph (144.84 km/h)91.91 mph (147.91 km/h)
95 mph (152.89 km/h)97.01 mph (156.13 km/h)
100 mph (160.93 km/h)102.12 mph (164.34 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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