Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
260/70r17 vs 275/85r17 Tire Comparison Side By Side
  260/70-17 275/85-17 Difference
Diameter inches (mm) 31.33 (795.8) 35.41 (899.3) 4.07 (103.5) 13%
Width inches (mm) 10.24 (260) 10.83 (275) 0.59 (15) 5.8%
Circum. inches (mm) 98.43 (2500.08) 111.23 (2825.23) 12.8 (325.15) 13%
Sidewall Height inches (mm) 7.17 (182) 9.2 (233.75) 2.04 (51.75) 28.4%
Revolutions per mile (km) 643.72 (399.99) 569.63 (353.95) -74.09 (-46.03) -11.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.6 mph (36.37 km/h)
25 mph (40.23 km/h)28.25 mph (45.47 km/h)
30 mph (48.28 km/h)33.9 mph (54.56 km/h)
35 mph (56.33 km/h)39.55 mph (63.65 km/h)
40 mph (64.37 km/h)45.2 mph (72.75 km/h)
45 mph (72.42 km/h)50.85 mph (81.84 km/h)
50 mph (80.47 km/h)56.5 mph (90.93 km/h)
55 mph (88.51 km/h)62.15 mph (100.03 km/h)
60 mph (96.56 km/h)67.8 mph (109.12 km/h)
65 mph (104.61 km/h)73.45 mph (118.21 km/h)
70 mph (112.65 km/h)79.1 mph (127.31 km/h)
75 mph (120.7 km/h)84.75 mph (136.4 km/h)
80 mph (128.75 km/h)90.4 mph (145.49 km/h)
85 mph (136.79 km/h)96.05 mph (154.59 km/h)
90 mph (144.84 km/h)101.71 mph (163.68 km/h)
95 mph (152.89 km/h)107.36 mph (172.77 km/h)
100 mph (160.93 km/h)113.01 mph (181.87 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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