Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/65r18 vs 265/60r18 Tire Comparison Side By Side
  235/65-18 265/60-18 Difference
Diameter inches (mm) 30.03 (762.7) 30.52 (775.2) 0.49 (12.5) 1.6%
Width inches (mm) 9.25 (235) 10.43 (265) 1.18 (30) 12.8%
Circum. inches (mm) 94.33 (2396.09) 95.88 (2435.36) 1.55 (39.27) 1.6%
Sidewall Height inches (mm) 6.01 (152.75) 6.26 (159) 0.25 (6.25) 4.1%
Revolutions per mile (km) 671.65 (417.35) 660.82 (410.62) -10.83 (-6.73) -1.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.33 mph (32.71 km/h)
25 mph (40.23 km/h)25.41 mph (40.89 km/h)
30 mph (48.28 km/h)30.49 mph (49.07 km/h)
35 mph (56.33 km/h)35.57 mph (57.25 km/h)
40 mph (64.37 km/h)40.66 mph (65.43 km/h)
45 mph (72.42 km/h)45.74 mph (73.61 km/h)
50 mph (80.47 km/h)50.82 mph (81.79 km/h)
55 mph (88.51 km/h)55.9 mph (89.96 km/h)
60 mph (96.56 km/h)60.98 mph (98.14 km/h)
65 mph (104.61 km/h)66.07 mph (106.32 km/h)
70 mph (112.65 km/h)71.15 mph (114.5 km/h)
75 mph (120.7 km/h)76.23 mph (122.68 km/h)
80 mph (128.75 km/h)81.31 mph (130.86 km/h)
85 mph (136.79 km/h)86.39 mph (139.04 km/h)
90 mph (144.84 km/h)91.48 mph (147.22 km/h)
95 mph (152.89 km/h)96.56 mph (155.39 km/h)
100 mph (160.93 km/h)101.64 mph (163.57 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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