Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
265/66r17 vs 275/80r17 Tire Comparison Side By Side
  265/66-17 275/80-17 Difference
Diameter inches (mm) 30.77 (781.6) 34.32 (871.8) 3.55 (90.2) 11.5%
Width inches (mm) 10.43 (265) 10.83 (275) 0.39 (10) 3.8%
Circum. inches (mm) 96.67 (2455.47) 107.83 (2738.84) 11.16 (283.37) 11.5%
Sidewall Height inches (mm) 6.89 (174.9) 8.66 (220) 1.78 (45.1) 25.8%
Revolutions per mile (km) 655.41 (407.25) 587.6 (365.12) -67.81 (-42.14) -10.3%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.31 mph (35.9 km/h)
25 mph (40.23 km/h)27.89 mph (44.88 km/h)
30 mph (48.28 km/h)33.46 mph (53.85 km/h)
35 mph (56.33 km/h)39.04 mph (62.83 km/h)
40 mph (64.37 km/h)44.62 mph (71.8 km/h)
45 mph (72.42 km/h)50.19 mph (80.78 km/h)
50 mph (80.47 km/h)55.77 mph (89.75 km/h)
55 mph (88.51 km/h)61.35 mph (98.73 km/h)
60 mph (96.56 km/h)66.92 mph (107.7 km/h)
65 mph (104.61 km/h)72.5 mph (116.68 km/h)
70 mph (112.65 km/h)78.08 mph (125.66 km/h)
75 mph (120.7 km/h)83.66 mph (134.63 km/h)
80 mph (128.75 km/h)89.23 mph (143.61 km/h)
85 mph (136.79 km/h)94.81 mph (152.58 km/h)
90 mph (144.84 km/h)100.39 mph (161.56 km/h)
95 mph (152.89 km/h)105.96 mph (170.53 km/h)
100 mph (160.93 km/h)111.54 mph (179.51 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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