tire

Tire Size Calculator

Calculate tire sizes in inches or millimeters and find alternative sizes.
Tread Width: 315
Aspect Ratio: 45
Wheel Diameter: 21
Inches
Millimeters

Results for 315/45R21 Tires

disc wheel
Diameter
32.2"
tire width
Width
12.4"
disc wheel
Sidewall
5.6"
tire circumference
Circumference
101"
tire rpm
Revs per mile
627

Alternate Tire Sizes

21"
16"
17"
18"
19"
20"
22"
23"
24"
26"
Tire Size
Diameter
Width
Sidewall
Circumference
Revs per mile
325/40R21
31,2"
-3.21%
12,8"
5,1"
98,1"
646
275/50R21
31,8"
-1.26%
10,8"
5,4"
99,9"
634
315/45R21
32,2"
0%
12,4"
5,6"
101,0"
627
Best fit