Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
90/70r10 vs 90/65r10 Tire Comparison Side By Side
  90/70-10 90/65-10 Difference
Diameter inches (mm) 14.96 (380) 14.61 (371) -0.35 (-9) -2.4%
Width inches (mm) 3.54 (90) 3.54 (90) 0 (0) 0%
Circum. inches (mm) 47 (1193.81) 45.89 (1165.53) -1.11 (-28.27) -2.4%
Sidewall Height inches (mm) 2.48 (63) 2.3 (58.5) -0.18 (-4.5) -7.1%
Revolutions per mile (km) 1348.08 (837.66) 1380.78 (857.98) 32.7 (20.32) 2.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.53 mph (31.42 km/h)
25 mph (40.23 km/h)24.41 mph (39.28 km/h)
30 mph (48.28 km/h)29.29 mph (47.14 km/h)
35 mph (56.33 km/h)34.17 mph (54.99 km/h)
40 mph (64.37 km/h)39.05 mph (62.85 km/h)
45 mph (72.42 km/h)43.93 mph (70.71 km/h)
50 mph (80.47 km/h)48.82 mph (78.56 km/h)
55 mph (88.51 km/h)53.7 mph (86.42 km/h)
60 mph (96.56 km/h)58.58 mph (94.27 km/h)
65 mph (104.61 km/h)63.46 mph (102.13 km/h)
70 mph (112.65 km/h)68.34 mph (109.99 km/h)
75 mph (120.7 km/h)73.22 mph (117.84 km/h)
80 mph (128.75 km/h)78.11 mph (125.7 km/h)
85 mph (136.79 km/h)82.99 mph (133.55 km/h)
90 mph (144.84 km/h)87.87 mph (141.41 km/h)
95 mph (152.89 km/h)92.75 mph (149.27 km/h)
100 mph (160.93 km/h)97.63 mph (157.12 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
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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