Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/65r17 vs 245/70r17 Tire Comparison Side By Side
  235/65-17 245/70-17 Difference
Diameter inches (mm) 29.03 (737.3) 30.5 (774.8) 1.48 (37.5) 5.1%
Width inches (mm) 9.25 (235) 9.65 (245) 0.39 (10) 4.3%
Circum. inches (mm) 91.19 (2316.3) 95.83 (2434.11) 4.64 (117.81) 5.1%
Sidewall Height inches (mm) 6.01 (152.75) 6.75 (171.5) 0.74 (18.75) 12.3%
Revolutions per mile (km) 694.79 (431.72) 661.16 (410.83) -33.63 (-20.9) -4.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.02 mph (33.82 km/h)
25 mph (40.23 km/h)26.27 mph (42.28 km/h)
30 mph (48.28 km/h)31.53 mph (50.74 km/h)
35 mph (56.33 km/h)36.78 mph (59.19 km/h)
40 mph (64.37 km/h)42.03 mph (67.65 km/h)
45 mph (72.42 km/h)47.29 mph (76.1 km/h)
50 mph (80.47 km/h)52.54 mph (84.56 km/h)
55 mph (88.51 km/h)57.8 mph (93.02 km/h)
60 mph (96.56 km/h)63.05 mph (101.47 km/h)
65 mph (104.61 km/h)68.31 mph (109.93 km/h)
70 mph (112.65 km/h)73.56 mph (118.38 km/h)
75 mph (120.7 km/h)78.81 mph (126.84 km/h)
80 mph (128.75 km/h)84.07 mph (135.3 km/h)
85 mph (136.79 km/h)89.32 mph (143.75 km/h)
90 mph (144.84 km/h)94.58 mph (152.21 km/h)
95 mph (152.89 km/h)99.83 mph (160.66 km/h)
100 mph (160.93 km/h)105.09 mph (169.12 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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