Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/70r16 vs 235/75r15 Tire Comparison Side By Side
  205/70-16 235/75-15 Difference
Diameter inches (mm) 27.3 (693.4) 28.88 (733.5) 1.58 (40.1) 5.8%
Width inches (mm) 8.07 (205) 9.25 (235) 1.18 (30) 14.6%
Circum. inches (mm) 85.76 (2178.38) 90.72 (2304.36) 4.96 (125.98) 5.8%
Sidewall Height inches (mm) 5.65 (143.5) 6.94 (176.25) 1.29 (32.75) 22.8%
Revolutions per mile (km) 738.78 (459.06) 698.39 (433.96) -40.39 (-25.1) -5.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.16 mph (34.05 km/h)
25 mph (40.23 km/h)26.45 mph (42.56 km/h)
30 mph (48.28 km/h)31.73 mph (51.07 km/h)
35 mph (56.33 km/h)37.02 mph (59.58 km/h)
40 mph (64.37 km/h)42.31 mph (68.1 km/h)
45 mph (72.42 km/h)47.6 mph (76.61 km/h)
50 mph (80.47 km/h)52.89 mph (85.12 km/h)
55 mph (88.51 km/h)58.18 mph (93.63 km/h)
60 mph (96.56 km/h)63.47 mph (102.15 km/h)
65 mph (104.61 km/h)68.76 mph (110.66 km/h)
70 mph (112.65 km/h)74.05 mph (119.17 km/h)
75 mph (120.7 km/h)79.34 mph (127.68 km/h)
80 mph (128.75 km/h)84.63 mph (136.19 km/h)
85 mph (136.79 km/h)89.92 mph (144.71 km/h)
90 mph (144.84 km/h)95.2 mph (153.22 km/h)
95 mph (152.89 km/h)100.49 mph (161.73 km/h)
100 mph (160.93 km/h)105.78 mph (170.24 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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