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 265/70r12 Tire Comparison Side By Side
  25/10-12 265/70-12 Difference
Diameter inches (mm) 25 (635) 26.61 (675.8) 1.61 (40.8) 6.4%
Width inches (mm) 10 (254) 10.43 (265) 0.43 (11) 4.3%
Circum. inches (mm) 78.54 (1994.91) 83.59 (2123.09) 5.05 (128.18) 6.4%
Sidewall Height inches (mm) 6.5 (165.1) 7.3 (185.5) 0.8 (20.4) 12.4%
Revolutions per mile (km) 806.72 (501.27) 758.02 (471.01) -48.7 (-30.26) -6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)21.29 mph (34.26 km/h)
25 mph (40.23 km/h)26.61 mph (42.82 km/h)
30 mph (48.28 km/h)31.93 mph (51.38 km/h)
35 mph (56.33 km/h)37.25 mph (59.95 km/h)
40 mph (64.37 km/h)42.57 mph (68.51 km/h)
45 mph (72.42 km/h)47.89 mph (77.07 km/h)
50 mph (80.47 km/h)53.21 mph (85.64 km/h)
55 mph (88.51 km/h)58.53 mph (94.2 km/h)
60 mph (96.56 km/h)63.86 mph (102.77 km/h)
65 mph (104.61 km/h)69.18 mph (111.33 km/h)
70 mph (112.65 km/h)74.5 mph (119.89 km/h)
75 mph (120.7 km/h)79.82 mph (128.46 km/h)
80 mph (128.75 km/h)85.14 mph (137.02 km/h)
85 mph (136.79 km/h)90.46 mph (145.58 km/h)
90 mph (144.84 km/h)95.78 mph (154.15 km/h)
95 mph (152.89 km/h)101.1 mph (162.71 km/h)
100 mph (160.93 km/h)106.43 mph (171.28 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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