Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
25/10r12 vs 270/60r12 Tire Comparison Side By Side
  25/10-12 270/60-12 Difference
Diameter inches (mm) 25 (635) 24.76 (628.8) -0.24 (-6.2) -1%
Width inches (mm) 10 (254) 10.63 (270) 0.63 (16) 6.3%
Circum. inches (mm) 78.54 (1994.91) 77.77 (1975.43) -0.77 (-19.48) -1%
Sidewall Height inches (mm) 6.5 (165.1) 6.38 (162) -0.12 (-3.1) -1.9%
Revolutions per mile (km) 806.72 (501.27) 814.68 (506.22) 7.95 (4.94) 1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.8 mph (31.87 km/h)
25 mph (40.23 km/h)24.76 mph (39.84 km/h)
30 mph (48.28 km/h)29.71 mph (47.81 km/h)
35 mph (56.33 km/h)34.66 mph (55.78 km/h)
40 mph (64.37 km/h)39.61 mph (63.75 km/h)
45 mph (72.42 km/h)44.56 mph (71.71 km/h)
50 mph (80.47 km/h)49.51 mph (79.68 km/h)
55 mph (88.51 km/h)54.46 mph (87.65 km/h)
60 mph (96.56 km/h)59.41 mph (95.62 km/h)
65 mph (104.61 km/h)64.37 mph (103.59 km/h)
70 mph (112.65 km/h)69.32 mph (111.55 km/h)
75 mph (120.7 km/h)74.27 mph (119.52 km/h)
80 mph (128.75 km/h)79.22 mph (127.49 km/h)
85 mph (136.79 km/h)84.17 mph (135.46 km/h)
90 mph (144.84 km/h)89.12 mph (143.43 km/h)
95 mph (152.89 km/h)94.07 mph (151.4 km/h)
100 mph (160.93 km/h)99.02 mph (159.36 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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