Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
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90/90r21 vs 110/90r19 Tire Comparison Side By Side
  90/90-21 110/90-19 Difference
Diameter inches (mm) 27.38 (695.4) 26.8 (680.6) -0.58 (-14.8) -2.1%
Width inches (mm) 3.54 (90) 4.33 (110) 0.79 (20) 22.2%
Circum. inches (mm) 86.01 (2184.66) 84.18 (2138.17) -1.83 (-46.5) -2.1%
Sidewall Height inches (mm) 3.19 (81) 3.9 (99) 0.71 (18) 22.2%
Revolutions per mile (km) 736.66 (457.74) 752.67 (467.69) 16.02 (9.95) 2.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.57 mph (31.5 km/h)
25 mph (40.23 km/h)24.47 mph (39.38 km/h)
30 mph (48.28 km/h)29.36 mph (47.25 km/h)
35 mph (56.33 km/h)34.26 mph (55.13 km/h)
40 mph (64.37 km/h)39.15 mph (63 km/h)
45 mph (72.42 km/h)44.04 mph (70.88 km/h)
50 mph (80.47 km/h)48.94 mph (78.75 km/h)
55 mph (88.51 km/h)53.83 mph (86.63 km/h)
60 mph (96.56 km/h)58.72 mph (94.51 km/h)
65 mph (104.61 km/h)63.62 mph (102.38 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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