tire

Tire Size Calculator

Calculate tire sizes in inches or millimeters and find alternative sizes.
Tread Width: 315
Aspect Ratio: 30
Wheel Diameter: 21
Inches
Millimeters

Results for 315/30R21 Tires

disc wheel
Diameter
28.4"
tire width
Width
12.4"
disc wheel
Sidewall
3.7"
tire circumference
Circumference
89.3"
tire rpm
Revs per mile
709

Alternate Tire Sizes

21"
15"
16"
17"
18"
19"
20"
22"
23"
Tire Size
Diameter
Width
Sidewall
Circumference
Revs per mile
285/30R21
27,7"
-2.53%
11,2"
3,4"
87,1"
728
245/35R21
27,8"
-2.16%
9,6"
3,4"
87,1"
727
345/25R21
27,8"
-2.16%
13,6"
3,4"
87,3"
726
355/25R21
28,0"
-1.43%
14,0"
3,5"
87,9"
721
295/30R21
28,0"
-1.43%
11,6"
3,5"
87,8"
722
255/35R21
28,0"
-1.43%
10,0"
3,5"
88,0"
720
305/30R21
28,2"
-0.71%
12,0"
3,6"
88,6"
715
Best fit
265/35R21
28,3"
-0.35%
10,4"
3,7"
88,9"
713
Best fit
315/30R21
28,4"
0%
12,4"
3,7"
89,3"
710
Best fit
275/35R21
28,6"
0.7%
10,8"
3,8"
89,7"
706
Best fit
245/40R21
28,7"
1.05%
9,6"
3,9"
90,2"
703
325/30R21
28,7"
1.05%
12,8"
3,8"
90,0"
704
335/30R21
28,9"
1.73%
13,2"
4,0"
90,8"
698
285/35R21
28,9"
1.73%
11,2"
3,9"
90,6"
699
255/40R21
29,0"
2.07%
10,0"
4,0"
91,2"
695
295/35R21
29,1"
2.41%
11,6"
4,1"
91,5"
693