Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/65r17 vs 275/70r17 Tire Comparison Side By Side
  255/65-17 275/70-17 Difference
Diameter inches (mm) 30.05 (763.3) 32.16 (816.8) 2.11 (53.5) 7%
Width inches (mm) 10.04 (255) 10.83 (275) 0.79 (20) 7.8%
Circum. inches (mm) 94.41 (2397.98) 101.03 (2566.05) 6.62 (168.08) 7%
Sidewall Height inches (mm) 6.53 (165.75) 7.58 (192.5) 1.05 (26.75) 16.1%
Revolutions per mile (km) 671.13 (417.02) 627.17 (389.7) -43.96 (-27.31) -6.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.4 mph (34.44 km/h)
25 mph (40.23 km/h)26.75 mph (43.05 km/h)
30 mph (48.28 km/h)32.1 mph (51.66 km/h)
35 mph (56.33 km/h)37.45 mph (60.28 km/h)
40 mph (64.37 km/h)42.8 mph (68.89 km/h)
45 mph (72.42 km/h)48.15 mph (77.5 km/h)
50 mph (80.47 km/h)53.5 mph (86.11 km/h)
55 mph (88.51 km/h)58.85 mph (94.72 km/h)
60 mph (96.56 km/h)64.21 mph (103.33 km/h)
65 mph (104.61 km/h)69.56 mph (111.94 km/h)
70 mph (112.65 km/h)74.91 mph (120.55 km/h)
75 mph (120.7 km/h)80.26 mph (129.16 km/h)
80 mph (128.75 km/h)85.61 mph (137.77 km/h)
85 mph (136.79 km/h)90.96 mph (146.38 km/h)
90 mph (144.84 km/h)96.31 mph (154.99 km/h)
95 mph (152.89 km/h)101.66 mph (163.6 km/h)
100 mph (160.93 km/h)107.01 mph (172.21 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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