Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
135/70r17 vs 145/70r17 Tire Comparison Side By Side
  135/70-17 145/70-17 Difference
Diameter inches (mm) 24.44 (620.8) 24.99 (634.8) 0.55 (14) 2.3%
Width inches (mm) 5.31 (135) 5.71 (145) 0.39 (10) 7.4%
Circum. inches (mm) 76.78 (1950.3) 78.52 (1994.28) 1.73 (43.98) 2.3%
Sidewall Height inches (mm) 3.72 (94.5) 4 (101.5) 0.28 (7) 7.4%
Revolutions per mile (km) 825.18 (512.74) 806.98 (501.43) -18.2 (-11.31) -2.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.45 mph (32.91 km/h)
25 mph (40.23 km/h)25.56 mph (41.14 km/h)
30 mph (48.28 km/h)30.68 mph (49.37 km/h)
35 mph (56.33 km/h)35.79 mph (57.6 km/h)
40 mph (64.37 km/h)40.9 mph (65.83 km/h)
45 mph (72.42 km/h)46.01 mph (74.05 km/h)
50 mph (80.47 km/h)51.13 mph (82.28 km/h)
55 mph (88.51 km/h)56.24 mph (90.51 km/h)
60 mph (96.56 km/h)61.35 mph (98.74 km/h)
65 mph (104.61 km/h)66.47 mph (106.97 km/h)
70 mph (112.65 km/h)71.58 mph (115.19 km/h)
75 mph (120.7 km/h)76.69 mph (123.42 km/h)
80 mph (128.75 km/h)81.8 mph (131.65 km/h)
85 mph (136.79 km/h)86.92 mph (139.88 km/h)
90 mph (144.84 km/h)92.03 mph (148.11 km/h)
95 mph (152.89 km/h)97.14 mph (156.34 km/h)
100 mph (160.93 km/h)102.26 mph (164.56 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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