tire

Tire Size Calculator

Calculate tire sizes in inches or millimeters and find alternative sizes.
Tread Width: 305
Aspect Ratio: 25
Wheel Diameter: 21
Inches
Millimeters

Results for 305/25R21 Tires

disc wheel
Diameter
27"
tire width
Width
12"
disc wheel
Sidewall
3"
tire circumference
Circumference
84.8"
tire rpm
Revs per mile
747

Alternate Tire Sizes

21"
14"
15"
16"
17"
18"
19"
20"
22"
Tire Size
Diameter
Width
Sidewall
Circumference
Revs per mile
275/25R21
26,4"
-2.27%
10,8"
2,7"
82,9"
764
235/30R21
26,6"
-1.5%
9,3"
2,8"
83,4"
760
245/30R21
26,8"
-0.75%
9,6"
2,9"
84,1"
753
Best fit
295/25R21
26,8"
-0.75%
11,6"
2,9"
84,2"
753
Best fit
305/25R21
27,0"
0%
12,0"
3,0"
84,8"
747
Best fit
255/30R21
27,0"
0%
10,0"
3,0"
84,9"
747
Best fit
265/30R21
27,3"
1.1%
10,4"
3,1"
85,6"
740
325/25R21
27,4"
1.46%
12,8"
3,2"
86,0"
737
275/30R21
27,5"
1.82%
10,8"
3,2"
86,3"
734
285/30R21
27,7"
2.53%
11,2"
3,4"
87,1"
728
345/25R21
27,8"
2.88%
13,6"
3,4"
87,3"
726
245/35R21
27,8"
2.88%
9,6"
3,4"
87,1"
727