Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
205/80r15 vs 215/75r15 Tire Comparison Side By Side
  205/80-15 215/75-15 Difference
Diameter inches (mm) 27.91 (709) 27.7 (703.5) -0.22 (-5.5) -0.8%
Width inches (mm) 8.07 (205) 8.46 (215) 0.39 (10) 4.9%
Circum. inches (mm) 87.69 (2227.39) 87.01 (2210.11) -0.68 (-17.28) -0.8%
Sidewall Height inches (mm) 6.46 (164) 6.35 (161.25) -0.11 (-2.75) -1.7%
Revolutions per mile (km) 722.52 (448.96) 728.17 (452.47) 5.65 (3.51) 0.8%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.84 mph (31.94 km/h)
25 mph (40.23 km/h)24.81 mph (39.92 km/h)
30 mph (48.28 km/h)29.77 mph (47.91 km/h)
35 mph (56.33 km/h)34.73 mph (55.89 km/h)
40 mph (64.37 km/h)39.69 mph (63.87 km/h)
45 mph (72.42 km/h)44.65 mph (71.86 km/h)
50 mph (80.47 km/h)49.61 mph (79.84 km/h)
55 mph (88.51 km/h)54.57 mph (87.83 km/h)
60 mph (96.56 km/h)59.53 mph (95.81 km/h)
65 mph (104.61 km/h)64.5 mph (103.8 km/h)
70 mph (112.65 km/h)69.46 mph (111.78 km/h)
75 mph (120.7 km/h)74.42 mph (119.76 km/h)
80 mph (128.75 km/h)79.38 mph (127.75 km/h)
85 mph (136.79 km/h)84.34 mph (135.73 km/h)
90 mph (144.84 km/h)89.3 mph (143.72 km/h)
95 mph (152.89 km/h)94.26 mph (151.7 km/h)
100 mph (160.93 km/h)99.22 mph (159.69 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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