tire

Tire Size Comparison

Compare tire sizes side-by-side in inches or millimeters.
Current Tire Size:
Tread Width: 185
Aspect Ratio: 65
Wheel Diameter: 15
New Tire Size:
Tread Width: 175
Aspect Ratio: 60
Wheel Diameter: 15
Inches
Millimeters

Current Tire Size: 185/65R15

disc wheel
Diameter
24.5"
tire width
Width
7.3"
disc wheel
Sidewall
4.7"
tire circumference
Circumference
76.8"
tire rpm
Revs per mile
825

New Tire Size: 175/60R15

disc wheel
Diameter
23.3"-5.15%
tire width
Width
6.9"-0.4"
disc wheel
Sidewall
4.1"-0.6"
tire circumference
Circumference
73.1"-3.7"
tire rpm
Revs per mile
86742

Speedometer Difference

20 mhp (19 mhp)
30 mhp (28.5 mhp)
40 mhp (38 mhp)
50 mhp (47.5 mhp)
60 mhp (57.1 mhp)
70 mhp (66.6 mhp)
80 mhp (76.1 mhp)
90 mhp (85.6 mhp)
100 mhp (95.1 mhp)