Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
34/12.5r18 vs 295/70r18 Tire Comparison Side By Side
  34/12.5-18 295/70-18 Difference
Diameter inches (mm) 34.03 (864.24) 34.26 (870.2) 0.23 (5.96) 0.7%
Width inches (mm) 12.52 (318) 11.61 (295) -0.91 (-23) -7.2%
Circum. inches (mm) 106.89 (2715.09) 107.63 (2733.81) 0.74 (18.72) 0.7%
Sidewall Height inches (mm) 8.01 (203.52) 8.13 (206.5) 0.12 (2.98) 1.5%
Revolutions per mile (km) 592.74 (368.31) 588.68 (365.79) -4.06 (-2.52) -0.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.14 mph (32.41 km/h)
25 mph (40.23 km/h)25.17 mph (40.51 km/h)
30 mph (48.28 km/h)30.21 mph (48.61 km/h)
35 mph (56.33 km/h)35.24 mph (56.72 km/h)
40 mph (64.37 km/h)40.28 mph (64.82 km/h)
45 mph (72.42 km/h)45.31 mph (72.92 km/h)
50 mph (80.47 km/h)50.34 mph (81.02 km/h)
55 mph (88.51 km/h)55.38 mph (89.12 km/h)
60 mph (96.56 km/h)60.41 mph (97.23 km/h)
65 mph (104.61 km/h)65.45 mph (105.33 km/h)
70 mph (112.65 km/h)70.48 mph (113.43 km/h)
75 mph (120.7 km/h)75.52 mph (121.53 km/h)
80 mph (128.75 km/h)80.55 mph (129.64 km/h)
85 mph (136.79 km/h)85.59 mph (137.74 km/h)
90 mph (144.84 km/h)90.62 mph (145.84 km/h)
95 mph (152.89 km/h)95.66 mph (153.94 km/h)
100 mph (160.93 km/h)100.69 mph (162.04 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
14981740187419572046211021802263237824932620272229073111327033723430364039334571
Better Fuel Economy Factory Ratios Increased Power

Most Popular 34/12.5-R18 Comparisons

To Top