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LT305/70R18 tires: size explained

LT305/70R18

LT305/70R18 is an LT (light truck) metric tire size. It is about 34.8 in (884 mm) tall, 305 mm wide, and made for a 18-inch wheel.

What LT305/70R18 means

A tire size describes the tire's shape and the wheel it fits. It says nothing about load capacity or speed capability, which are printed separately on the sidewall.

LTLT (light truck)
LT means light truck. These tires are built to a light-truck load standard rather than the passenger-tire one. How much a specific tire can carry is set by its load index and load range on the sidewall, not by the size.
305Section width
The tire's width is 305 millimeters (12.0 in), measured from sidewall to sidewall.
70Aspect ratio
The sidewall height is 70% of the width. For 305 mm that is about 8.4 in (214 mm). A smaller number means a shorter sidewall.
RRadial construction
R means radial construction, where the internal cords run across the tire from one edge to the other.
18Wheel (rim) diameter
The tire is made for a wheel 18 inches across. Its overall diameter is larger: about 34.8 in (884 mm).

LT305/70R18 dimensions

34.8 inOverall diameter: 34.8 in (884 mm)Rim diameter: 18.0 in (457 mm)Sidewall height: 8.4 in (214 mm)12.0 inSection width: 12.0 in (305 mm)Sidewall height: 8.4 in (214 mm)
Each drawing is to scale on its own. The curves of the tread shoulder and bead are simplified; the table below has the same numbers.
Section width
12.0 in (305 mm)
Sidewall height
8.4 in (214 mm)
Wheel (rim) diameter
18.0 in (457 mm)
Overall diameter
34.8 in (884 mm)
Circumference
109.4 in (2778 mm)
Revolutions per mile
579

These are nominal design dimensions. Real tires vary by brand, tread depth, wheel width, load and pressure.

Which vehicles use LT305/70R18?

These vehicles list LT305/70R18 among their verified sizes, by trim. Open one to see all of its sizes.

Shop for LT305/70R18 tires

Confirm the size on your tire sidewall or door placard first. These links open each store's own search for LT305/70R18; prices and stock are on their sites.

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Snow chains and tire socks for LT305/70R18

Where winter roads call for extra traction, chains and tire socks are two options that fit over your tires. They are made for specific tire sizes, so these links open Amazon searches for LT305/70R18. Whether they suit your vehicle depends on its clearance and the local rules.

Snow chains for LT305/70R18 (Amazon search, opens in a new tab)Tire socks for LT305/70R18 (Amazon search, opens in a new tab)

Paid links to Amazon search results. As an Amazon Associate I earn from qualifying purchases. Read our affiliate disclosure.

Before you buy

  • Chains and socks are sold by tire size, so match the size on your sidewall exactly.
  • Check your owner's manual first: many newer cars and SUVs limit or prohibit chains, or require low-profile (often called SAE Class S) chains because of tight wheel-well clearance.
  • Tire socks are a lighter-duty option; check your state's rules, because some areas only accept chains when chain controls are in effect.
  • Put them on the drive wheels (or as your manual says) and follow the maker's speed limit.

Similar sizes

These common sizes have an overall diameter within about 3% of LT305/70R18. A common rule of thumb is to keep a replacement size within about 3% of the original overall diameter. Confirm any size change with your vehicle's owner's manual or a tire professional.

Common sizes with an overall diameter close to LT305/70R18
SizeWheel diameterDiameter differenceCalculator
35x12.50R20LT20 in (different)+0.54%Compare LT305/70R18 with 35x12.50R20LT
LT275/65R2020 in (different)-2.11%Compare LT305/70R18 with LT275/65R20

Compare LT305/70R18 with similar sizes

Side-by-side dimensions and speedometer difference for sizes close to LT305/70R18 in overall diameter.

Compare LT305/70R18 with another size

See how another size differs in height, width, sidewall and speedometer reading in the tire size calculator.

Compare LT305/70R18 with another size

Questions about LT305/70R18

What does LT305/70R18 mean?

LT305/70R18 describes the shape and size of a tire, not how much it can carry or how fast it can go. 305 is the width in millimeters, 70 is the sidewall height as a percentage of that width (about 214 mm), R is the construction type and 18 is the wheel diameter in inches.

How tall is a LT305/70R18 tire?

A LT305/70R18 tire has a nominal overall diameter of about 34.8 in (884 mm), with a sidewall about 8.4 in (214 mm) tall. These are nominal design dimensions. Real tires vary by brand, tread depth, wheel width, load and pressure.

How many revolutions per mile does a LT305/70R18 tire make?

About 579 revolutions per mile, based on a circumference of 109.4 in (2778 mm). A vehicle's speedometer and odometer are calibrated to the tire size it was built with, so a size with a different overall diameter changes what they read. A common rule of thumb is to keep a replacement size within about 3% of the original overall diameter. Confirm any size change with your vehicle's owner's manual or a tire professional.

Which sizes have a similar diameter to LT305/70R18?

Among the common sizes we list, these are within about 3% of the overall diameter of LT305/70R18: 35x12.50R20LT (+0.54%), LT275/65R20 (-2.11%). Diameter is only one measure. Width, wheel diameter, load capacity and clearance matter too. Confirm any size change with your vehicle's owner's manual or a tire professional.

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Paid links to Amazon search results. As an Amazon Associate I earn from qualifying purchases. Read our affiliate disclosure.