Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/90r16 vs 205/65r16 Tire Comparison Side By Side
  125/90-16 205/65-16 Difference
Diameter inches (mm) 24.86 (631.4) 26.49 (672.9) 1.63 (41.5) 6.6%
Width inches (mm) 4.92 (125) 8.07 (205) 3.15 (80) 64%
Circum. inches (mm) 78.09 (1983.6) 83.23 (2113.98) 5.13 (130.38) 6.6%
Sidewall Height inches (mm) 4.43 (112.5) 5.25 (133.25) 0.82 (20.75) 18.4%
Revolutions per mile (km) 811.32 (504.13) 761.29 (473.04) -50.04 (-31.09) -6.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.31 mph (34.3 km/h)
25 mph (40.23 km/h)26.64 mph (42.88 km/h)
30 mph (48.28 km/h)31.97 mph (51.45 km/h)
35 mph (56.33 km/h)37.3 mph (60.03 km/h)
40 mph (64.37 km/h)42.63 mph (68.6 km/h)
45 mph (72.42 km/h)47.96 mph (77.18 km/h)
50 mph (80.47 km/h)53.29 mph (85.76 km/h)
55 mph (88.51 km/h)58.61 mph (94.33 km/h)
60 mph (96.56 km/h)63.94 mph (102.91 km/h)
65 mph (104.61 km/h)69.27 mph (111.48 km/h)
70 mph (112.65 km/h)74.6 mph (120.06 km/h)
75 mph (120.7 km/h)79.93 mph (128.63 km/h)
80 mph (128.75 km/h)85.26 mph (137.21 km/h)
85 mph (136.79 km/h)90.59 mph (145.79 km/h)
90 mph (144.84 km/h)95.92 mph (154.36 km/h)
95 mph (152.89 km/h)101.24 mph (162.94 km/h)
100 mph (160.93 km/h)106.57 mph (171.51 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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