Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/75r16 vs 245/75r16 Tire Comparison Side By Side
  235/75-16 245/75-16 Difference
Diameter inches (mm) 29.88 (758.9) 30.47 (773.9) 0.59 (15) 2%
Width inches (mm) 9.25 (235) 9.65 (245) 0.39 (10) 4.3%
Circum. inches (mm) 93.86 (2384.15) 95.72 (2431.28) 1.86 (47.12) 2%
Sidewall Height inches (mm) 6.94 (176.25) 7.23 (183.75) 0.3 (7.5) 4.3%
Revolutions per mile (km) 675.02 (419.44) 661.93 (411.31) -13.08 (-8.13) -1.9%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.4 mph (32.82 km/h)
25 mph (40.23 km/h)25.49 mph (41.03 km/h)
30 mph (48.28 km/h)30.59 mph (49.23 km/h)
35 mph (56.33 km/h)35.69 mph (57.44 km/h)
40 mph (64.37 km/h)40.79 mph (65.65 km/h)
45 mph (72.42 km/h)45.89 mph (73.85 km/h)
50 mph (80.47 km/h)50.99 mph (82.06 km/h)
55 mph (88.51 km/h)56.09 mph (90.26 km/h)
60 mph (96.56 km/h)61.19 mph (98.47 km/h)
65 mph (104.61 km/h)66.28 mph (106.68 km/h)
70 mph (112.65 km/h)71.38 mph (114.88 km/h)
75 mph (120.7 km/h)76.48 mph (123.09 km/h)
80 mph (128.75 km/h)81.58 mph (131.29 km/h)
85 mph (136.79 km/h)86.68 mph (139.5 km/h)
90 mph (144.84 km/h)91.78 mph (147.7 km/h)
95 mph (152.89 km/h)96.88 mph (155.91 km/h)
100 mph (160.93 km/h)101.98 mph (164.12 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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