305/30R18 Tires

305/30R18 Conversion

When converted to inches, 305/30R18 is equivalent to 25.2x12R18.

305/30R18 tire has a section width of 12 inches which is the measurement of tire's width from its inner sidewall to its outer sidewall. Rim diameter of 18 inches represents the size of the wheel the tire can be mounted on. Sidewall height of 3.6 inches (92 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 25.2 inches (641 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 79.1 inches (2012.7 mm) is the outer perimeter of the tire. Tire revolutions indicate the number of times a tire revolves while it covers the distance in miles or kilometers. 305/30R18 tire makes 801 revolutions per mile (497 revolutions per kilometer).

305/30R18 Section Width
12"
25.2"
305/30R18 Tire Side
Tire Circumference
79.1"
18"
3.6"
801 Revs/Mile
Metric Inches
Overall Diameter (Tire Height) 641 mm 25.2"
Tread Width 305 mm 12"
Rim Diameter 457.2 mm 18"
Sidewall Height 92 mm 3.6"
Circumference 2012.7 mm 79.1"
Revolutions 497 per km 801 per mile

305/30R18 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 305/30R18 tire can be replaced with 46 compatible tire sizes. Select optional plus size to see its specs.

Tire Size Overall Diameter Difference
235/30R19 24.6" (625 mm) -2.5%
215/40R18 24.8" (629 mm) -1.9%
245/35R18 24.8" (629 mm) -1.9%
285/30R18 24.8" (629 mm) -1.9%
295/25R19 24.8" (631 mm) -1.6%
245/30R19 24.8" (631 mm) -1.6%
125/70R18 24.9" (633 mm) -1.2%
215/35R19 24.9" (633 mm) -1.2%
255/35R18 25" (635 mm) -0.9%
295/30R18 25" (635 mm) -0.9%
305/25R19 25" (635 mm) -0.9%
255/30R19 25.1" (637 mm) -0.6%
225/40R18 25.1" (637 mm) -0.6%
215/30R20 25.1" (638 mm) -0.5%
205/45R18 25.2" (641 mm) 0%
315/25R19 25.2" (641 mm) 0%
225/35R19 25.2" (641 mm) 0%
155/60R18 25.3" (643 mm) 0.3%
265/30R19 25.3" (643 mm) 0.3%
265/35R18 25.3" (643 mm) 0.3%
225/30R20 25.4" (644 mm) 0.5%
145/65R18 25.4" (645 mm) 0.6%
135/60R19 25.4" (645 mm) 0.6%
235/40R18 25.4" (645 mm) 0.6%
115/70R19 25.4" (645 mm) 0.6%
275/25R20 25.4" (646 mm) 0.8%
235/35R19 25.5" (647 mm) 0.9%
135/70R18 25.5" (647 mm) 0.9%
315/30R18 25.5" (647 mm) 0.9%
275/35R18 25.6" (649 mm) 1.2%
275/30R19 25.6" (649 mm) 1.2%
285/25R20 25.6" (650 mm) 1.4%
235/30R20 25.6" (650 mm) 1.4%
215/45R18 25.6" (651 mm) 1.6%
335/25R19 25.6" (651 mm) 1.6%
245/40R18 25.7" (653 mm) 1.9%
245/35R19 25.8" (655 mm) 2.2%
285/30R19 25.8" (655 mm) 2.2%
215/40R19 25.8" (655 mm) 2.2%
295/25R20 25.8" (656 mm) 2.3%
245/30R20 25.8" (656 mm) 2.3%
285/35R18 25.9" (657 mm) 2.5%
125/70R19 25.9" (659 mm) 2.8%
225/45R18 25.9" (659 mm) 2.8%
335/30R18 25.9" (659 mm) 2.8%
305/25R20 26" (660 mm) 3%