205/40R18 Tires

205/40R18 Conversion

When converted to inches, 205/40R18 is equivalent to 24.4x8.1R18.

205/40R18 tire has a section width of 8.1 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 3.2 inches (82 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 24.4 inches (621 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 76.6 inches (1949.9 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. 205/40R18 tire makes 827 revolutions per mile (513 revolutions per kilometer).

205/40R18 Section Width
8.1"
24.4"
205/40R18 Tire Side
Tire Circumference
76.6"
18"
3.2"
827 Revs/Mile
Metric Inches
Overall Diameter (Tire Height) 621 mm 24.4"
Tread Width 205 mm 8.1"
Rim Diameter 457.2 mm 18"
Sidewall Height 82 mm 3.2"
Circumference 1949.9 mm 76.6"
Revolutions 513 per km 827 per mile
Best Prices on 205/40R18 Tires
Amazon
eBay
TireRack from $176.04
Discount Tire from $160.00
Priority Tire from $81.93
Simple Tire from $91.96

As an associate, we earn commissions on qualifying purchases through the affiliate links on this website.

205/40R18 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 205/40R18 tire can be replaced with 24 compatible tire sizes. Select optional plus size to see its specs.

Tire Size Overall Diameter Difference
245/30R18 23.8" (605 mm) -2.6%
125/60R18 23.9" (607 mm) -2.3%
215/35R18 23.9" (607 mm) -2.3%
255/30R18 24.1" (611 mm) -1.6%
175/45R18 24.2" (615 mm) -1%
225/35R18 24.2" (615 mm) -1%
265/30R18 24.3" (617 mm) -0.6%
135/60R18 24.4" (619 mm) -0.3%
225/30R19 24.4" (619 mm) -0.3%
235/35R18 24.4" (621 mm) 0%
235/30R19 24.6" (625 mm) 0.6%
285/30R18 24.8" (629 mm) 1.3%
245/35R18 24.8" (629 mm) 1.3%
215/40R18 24.8" (629 mm) 1.3%
245/30R19 24.8" (631 mm) 1.6%
295/25R19 24.8" (631 mm) 1.6%
215/35R19 24.9" (633 mm) 1.9%
125/70R18 24.9" (633 mm) 1.9%
295/30R18 25" (635 mm) 2.3%
255/35R18 25" (635 mm) 2.3%
305/25R19 25" (635 mm) 2.3%
255/30R19 25.1" (637 mm) 2.6%
225/40R18 25.1" (637 mm) 2.6%
215/30R20 25.1" (638 mm) 2.7%