Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/55r17 vs 265/70r17 Tire Comparison Side By Side
  255/55-17 265/70-17 Difference
Diameter inches (mm) 28.04 (712.3) 31.61 (802.8) 3.56 (90.5) 12.7%
Width inches (mm) 10.04 (255) 10.43 (265) 0.39 (10) 3.9%
Circum. inches (mm) 88.1 (2237.76) 99.29 (2522.07) 11.19 (284.31) 12.7%
Sidewall Height inches (mm) 5.52 (140.25) 7.3 (185.5) 1.78 (45.25) 32.3%
Revolutions per mile (km) 719.18 (446.88) 638.1 (396.5) -81.07 (-50.38) -11.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.54 mph (36.28 km/h)
25 mph (40.23 km/h)28.18 mph (45.35 km/h)
30 mph (48.28 km/h)33.81 mph (54.41 km/h)
35 mph (56.33 km/h)39.45 mph (63.48 km/h)
40 mph (64.37 km/h)45.08 mph (72.55 km/h)
45 mph (72.42 km/h)50.72 mph (81.62 km/h)
50 mph (80.47 km/h)56.35 mph (90.69 km/h)
55 mph (88.51 km/h)61.99 mph (99.76 km/h)
60 mph (96.56 km/h)67.62 mph (108.83 km/h)
65 mph (104.61 km/h)73.26 mph (117.9 km/h)
70 mph (112.65 km/h)78.89 mph (126.97 km/h)
75 mph (120.7 km/h)84.53 mph (136.04 km/h)
80 mph (128.75 km/h)90.16 mph (145.11 km/h)
85 mph (136.79 km/h)95.8 mph (154.17 km/h)
90 mph (144.84 km/h)101.43 mph (163.24 km/h)
95 mph (152.89 km/h)107.07 mph (172.31 km/h)
100 mph (160.93 km/h)112.71 mph (181.38 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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