305/40R20 tire size in inches

305/40R20 tires are 29.6″ tall, have a section width of 12.0″, and fit wheels with a diameter of 20. The circumference is 93.0″ that translates into 682 revolutions per mile. As a rule, they can be mounted on the wheels with 20″ x 10-12″ rim width. In the high flotation system, the equivalent tire size is 29.6X12R20.

What is 305/40R20 in inches?

Tire Diameter:29.6″
Tire Section Width:12.0″
Rim Width Range:20″ x 10-12″
Sidewall Height:4.8″
Circumference:93.0″
Revs/Mile:682

Alternate sizes – Upsizing Wheels or Tires?

What is a 305/40R20 equivalent to?

Check out the chart below to find possible alternatives to the 305/40R20 tire size staying within the 3%-range of the tire diameter, allowing to choose wider wheels or tires with smaller sidewalls. A good rule of thumb is to avoid decreasing the diameter of the wheel. If you are not sure about the custom sizes, consult the experts or stick to the factory tire size.

Tire sizeDiameterDifferenceWidthWheel size
235/50R2029.3″-1.01%9.3″20
245/50R2029.6″0%9.6″20
255/45R2029.0″-2.03%10.0″20
265/45R2029.4″-0.68%10.4″20
275/45R2029.7″0.34%10.8″20
285/40R2029.0″-2.03%11.2″20
381/30/R2029.0″-2.03%15.0″20
457/25/R2029.0″-2.03%18.0″20
295/40R2029.3″-1.01%11.6″20
325/35R2029.0″-2.03%12.8″20
235/55R2030.2″2.03%9.3″20
255/50R2030.0″1.35%10.0″20
265/50R2030.4″2.7%10.4″20
285/45R2030.1″1.69%11.2″20
Upsizing chart

What does 305/40R20 mean?

Trying to decode the size of the tires? Scroll down the page to learn what all these numbers on the sidewall stand for.

P or LTThe first letter in the string denotes the class. P stands for passenger vehicles, LT is intended for light trucks carrying heavy loads.
305It means the width of the tire is 305 millimeters
40The tire has an aspect ratio of 40. To put it simple, the sidewall height is 40% of the width, so it would be 4.8″.
RR stands for the Radial, a standard construction method for about 99% of tires.
20The tire is designed to fit 20″ x 10-12″ rims that are 20 inches in diameter.

Popular questions about 305/40R20 tire size

How wide is a 305/40R20 tire?

The tires of the given size have a section width of 12.0″ inches.

How tall is a 305/40R20 tire?

The height of the following tire size equals 29.6″ inches.

What rims will fit 305/40R20 tires?

For each tire size, often there are several wheel sizes. You can’t put very wide tires on narrow rims or vise versa. You need the rim size of 20″ x 10-12″ for 305/40R20 tires.

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