Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
175/70r12 vs 175/70r10 Tire Comparison Side By Side
  175/70-12 175/70-10 Difference
Diameter inches (mm) 21.65 (549.8) 19.65 (499) -2 (-50.8) -9.2%
Width inches (mm) 6.89 (175) 6.89 (175) 0 (0) 0%
Circum. inches (mm) 68 (1727.25) 61.72 (1567.65) -6.28 (-159.59) -9.2%
Sidewall Height inches (mm) 4.82 (122.5) 4.82 (122.5) 0 (0) 0%
Revolutions per mile (km) 931.74 (578.95) 1026.59 (637.89) 94.85 (58.94) 10.2%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)18.15 mph (29.21 km/h)
25 mph (40.23 km/h)22.69 mph (36.52 km/h)
30 mph (48.28 km/h)27.23 mph (43.82 km/h)
35 mph (56.33 km/h)31.77 mph (51.12 km/h)
40 mph (64.37 km/h)36.3 mph (58.43 km/h)
45 mph (72.42 km/h)40.84 mph (65.73 km/h)
50 mph (80.47 km/h)45.38 mph (73.03 km/h)
55 mph (88.51 km/h)49.92 mph (80.34 km/h)
60 mph (96.56 km/h)54.46 mph (87.64 km/h)
65 mph (104.61 km/h)58.99 mph (94.94 km/h)
70 mph (112.65 km/h)63.53 mph (102.25 km/h)
75 mph (120.7 km/h)68.07 mph (109.55 km/h)
80 mph (128.75 km/h)72.61 mph (116.85 km/h)
85 mph (136.79 km/h)77.15 mph (124.16 km/h)
90 mph (144.84 km/h)81.68 mph (131.46 km/h)
95 mph (152.89 km/h)86.22 mph (138.76 km/h)
100 mph (160.93 km/h)90.76 mph (146.06 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
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