tire

Tire Size Calculator

Calculate tire sizes in inches or millimeters and find alternative sizes.
Tread Width: 285
Aspect Ratio: 30
Wheel Diameter: 18
Inches
Millimeters

Results for 285/30R18 Tires

disc wheel
Diameter
24.7"
tire width
Width
11.2"
disc wheel
Sidewall
3.4"
tire circumference
Circumference
77.7"
tire rpm
Revs per mile
816

Alternate Tire Sizes

18"
13"
14"
15"
16"
17"
19"
20"
Tire Size
Diameter
Width
Sidewall
Circumference
Revs per mile
225/35R18
24,2"
-2.07%
8,9"
3,1"
76,0"
834
205/40R18
24,5"
-0.82%
8,1"
3,2"
76,8"
825
Best fit
285/30R18
24,7"
0%
11,2"
3,4"
77,7"
816
Best fit
245/35R18
24,8"
0.4%
9,6"
3,4"
77,7"
815
Best fit
215/40R18
24,8"
0.4%
8,5"
3,4"
77,8"
815
Best fit
195/45R18
24,9"
0.8%
7,7"
3,5"
78,2"
810
Best fit
255/35R18
25,0"
1.2%
10,0"
3,5"
78,6"
806
295/30R18
25,0"
1.2%
11,6"
3,5"
78,4"
808
225/40R18
25,1"
1.59%
8,9"
3,5"
78,8"
804
265/35R18
25,3"
2.37%
10,4"
3,7"
79,5"
798
205/45R18
25,3"
2.37%
8,1"
3,6"
79,3"
799
315/30R18
25,4"
2.76%
12,4"
3,7"
79,9"
793
235/40R18
25,4"
2.76%
9,3"
3,7"
79,8"
794