Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/85r13 vs 175/70r14 Tire Comparison Side By Side
  175/85-13 175/70-14 Difference
Diameter inches (mm) 24.71 (627.7) 23.65 (600.6) -1.07 (-27.1) -4.3%
Width inches (mm) 6.89 (175) 6.89 (175) 0 (0) 0%
Circum. inches (mm) 77.64 (1971.98) 74.29 (1886.84) -3.35 (-85.14) -4.3%
Sidewall Height inches (mm) 5.86 (148.75) 4.82 (122.5) -1.03 (-26.25) -17.6%
Revolutions per mile (km) 816.11 (507.1) 852.93 (529.99) 36.82 (22.88) 4.5%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.14 mph (30.8 km/h)
25 mph (40.23 km/h)23.92 mph (38.5 km/h)
30 mph (48.28 km/h)28.7 mph (46.2 km/h)
35 mph (56.33 km/h)33.49 mph (53.9 km/h)
40 mph (64.37 km/h)38.27 mph (61.59 km/h)
45 mph (72.42 km/h)43.06 mph (69.29 km/h)
50 mph (80.47 km/h)47.84 mph (76.99 km/h)
55 mph (88.51 km/h)52.63 mph (84.69 km/h)
60 mph (96.56 km/h)57.41 mph (92.39 km/h)
65 mph (104.61 km/h)62.19 mph (100.09 km/h)
70 mph (112.65 km/h)66.98 mph (107.79 km/h)
75 mph (120.7 km/h)71.76 mph (115.49 km/h)
80 mph (128.75 km/h)76.55 mph (123.19 km/h)
85 mph (136.79 km/h)81.33 mph (130.89 km/h)
90 mph (144.84 km/h)86.11 mph (138.59 km/h)
95 mph (152.89 km/h)90.9 mph (146.29 km/h)
100 mph (160.93 km/h)95.68 mph (153.99 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
21712522271528362965305731593279344536113796394442124507473848864969527456996622
Better Fuel Economy Factory Ratios Increased Power

Most Popular 175/85-R13 Comparisons

To Top