Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/70r17 vs 215/55r17 Tire Comparison Side By Side
  125/70-17 215/55-17 Difference
Diameter inches (mm) 23.89 (606.8) 26.31 (668.3) 2.42 (61.5) 10.1%
Width inches (mm) 4.92 (125) 8.46 (215) 3.54 (90) 72%
Circum. inches (mm) 75.05 (1906.32) 82.66 (2099.53) 7.61 (193.21) 10.1%
Sidewall Height inches (mm) 3.44 (87.5) 4.66 (118.25) 1.21 (30.75) 35.1%
Revolutions per mile (km) 844.22 (524.57) 766.53 (476.3) -77.69 (-48.27) -9.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)22.03 mph (35.45 km/h)
25 mph (40.23 km/h)27.53 mph (44.31 km/h)
30 mph (48.28 km/h)33.04 mph (53.17 km/h)
35 mph (56.33 km/h)38.55 mph (62.04 km/h)
40 mph (64.37 km/h)44.05 mph (70.9 km/h)
45 mph (72.42 km/h)49.56 mph (79.76 km/h)
50 mph (80.47 km/h)55.07 mph (88.62 km/h)
55 mph (88.51 km/h)60.57 mph (97.49 km/h)
60 mph (96.56 km/h)66.08 mph (106.35 km/h)
65 mph (104.61 km/h)71.59 mph (115.21 km/h)
70 mph (112.65 km/h)77.09 mph (124.07 km/h)
75 mph (120.7 km/h)82.6 mph (132.93 km/h)
80 mph (128.75 km/h)88.11 mph (141.8 km/h)
85 mph (136.79 km/h)93.61 mph (150.66 km/h)
90 mph (144.84 km/h)99.12 mph (159.52 km/h)
95 mph (152.89 km/h)104.63 mph (168.38 km/h)
100 mph (160.93 km/h)110.14 mph (177.25 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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