Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
125/65r12 vs 120/65r12 Tire Comparison Side By Side
  125/65-12 120/65-12 Difference
Diameter inches (mm) 18.4 (467.3) 18.14 (460.8) -0.26 (-6.5) -1.4%
Width inches (mm) 4.92 (125) 4.72 (120) -0.2 (-5) -4%
Circum. inches (mm) 57.8 (1468.07) 56.99 (1447.65) -0.8 (-20.42) -1.4%
Sidewall Height inches (mm) 3.2 (81.25) 3.07 (78) -0.13 (-3.25) -4%
Revolutions per mile (km) 1096.23 (681.17) 1111.7 (690.78) 15.46 (9.61) 1.4%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.72 mph (31.74 km/h)
25 mph (40.23 km/h)24.65 mph (39.67 km/h)
30 mph (48.28 km/h)29.58 mph (47.61 km/h)
35 mph (56.33 km/h)34.51 mph (55.54 km/h)
40 mph (64.37 km/h)39.44 mph (63.48 km/h)
45 mph (72.42 km/h)44.37 mph (71.41 km/h)
50 mph (80.47 km/h)49.3 mph (79.35 km/h)
55 mph (88.51 km/h)54.23 mph (87.28 km/h)
60 mph (96.56 km/h)59.17 mph (95.22 km/h)
65 mph (104.61 km/h)64.1 mph (103.15 km/h)
70 mph (112.65 km/h)69.03 mph (111.09 km/h)
75 mph (120.7 km/h)73.96 mph (119.02 km/h)
80 mph (128.75 km/h)78.89 mph (126.96 km/h)
85 mph (136.79 km/h)83.82 mph (134.89 km/h)
90 mph (144.84 km/h)88.75 mph (142.83 km/h)
95 mph (152.89 km/h)93.68 mph (150.76 km/h)
100 mph (160.93 km/h)98.61 mph (158.7 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
Better Fuel Economy Factory Ratios Increased Power

Most Popular 125/65-R12 Comparisons

To Top