Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
255/65r18 vs 265/70r17 Tire Comparison Side By Side
  255/65-18 265/70-17 Difference
Diameter inches (mm) 31.05 (788.7) 31.61 (802.8) 0.56 (14.1) 1.8%
Width inches (mm) 10.04 (255) 10.43 (265) 0.39 (10) 3.9%
Circum. inches (mm) 97.55 (2477.77) 99.29 (2522.07) 1.74 (44.3) 1.8%
Sidewall Height inches (mm) 6.53 (165.75) 7.3 (185.5) 0.78 (19.75) 11.9%
Revolutions per mile (km) 649.51 (403.59) 638.1 (396.5) -11.41 (-7.09) -1.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.36 mph (32.76 km/h)
25 mph (40.23 km/h)25.45 mph (40.95 km/h)
30 mph (48.28 km/h)30.54 mph (49.14 km/h)
35 mph (56.33 km/h)35.63 mph (57.33 km/h)
40 mph (64.37 km/h)40.72 mph (65.52 km/h)
45 mph (72.42 km/h)45.8 mph (73.72 km/h)
50 mph (80.47 km/h)50.89 mph (81.91 km/h)
55 mph (88.51 km/h)55.98 mph (90.1 km/h)
60 mph (96.56 km/h)61.07 mph (98.29 km/h)
65 mph (104.61 km/h)66.16 mph (106.48 km/h)
70 mph (112.65 km/h)71.25 mph (114.67 km/h)
75 mph (120.7 km/h)76.34 mph (122.86 km/h)
80 mph (128.75 km/h)81.43 mph (131.05 km/h)
85 mph (136.79 km/h)86.52 mph (139.24 km/h)
90 mph (144.84 km/h)91.61 mph (147.43 km/h)
95 mph (152.89 km/h)96.7 mph (155.62 km/h)
100 mph (160.93 km/h)101.79 mph (163.81 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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