Mike "Wuzzy121". Rest in peace, brother

Tire Size Calculator

Tire Size Finder (optional):

Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
170/70r16 vs 170/65r16 Tire Comparison Side By Side
  170/70-16 170/65-16 Difference
Diameter inches (mm) 25.37 (644.4) 24.7 (627.4) -0.67 (-17) -2.6%
Width inches (mm) 6.69 (170) 6.69 (170) 0 (0) 0%
Circum. inches (mm) 79.7 (2024.44) 77.6 (1971.04) -2.1 (-53.41) -2.6%
Sidewall Height inches (mm) 4.69 (119) 4.35 (110.5) -0.33 (-8.5) -7.1%
Revolutions per mile (km) 794.96 (493.96) 816.5 (507.35) 21.54 (13.38) 2.7%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)19.47 mph (31.34 km/h)
25 mph (40.23 km/h)24.34 mph (39.17 km/h)
30 mph (48.28 km/h)29.21 mph (47.01 km/h)
35 mph (56.33 km/h)34.08 mph (54.84 km/h)
40 mph (64.37 km/h)38.94 mph (62.68 km/h)
45 mph (72.42 km/h)43.81 mph (70.51 km/h)
50 mph (80.47 km/h)48.68 mph (78.34 km/h)
55 mph (88.51 km/h)53.55 mph (86.18 km/h)
60 mph (96.56 km/h)58.42 mph (94.01 km/h)
65 mph (104.61 km/h)63.29 mph (101.85 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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