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LT315/70R17 tires: size explained

LT315/70R17

LT315/70R17 is an LT (light truck) metric tire size. It is about 34.4 in (873 mm) tall, 315 mm wide, and made for a 17-inch wheel.

What LT315/70R17 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.
315Section width
The tire's width is 315 millimeters (12.4 in), measured from sidewall to sidewall.
70Aspect ratio
The sidewall height is 70% of the width. For 315 mm that is about 8.7 in (221 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.
17Wheel (rim) diameter
The tire is made for a wheel 17 inches across. Its overall diameter is larger: about 34.4 in (873 mm).

LT315/70R17 dimensions

34.4 inOverall diameter: 34.4 in (873 mm)Rim diameter: 17.0 in (432 mm)Sidewall height: 8.7 in (221 mm)12.4 inSection width: 12.4 in (315 mm)Sidewall height: 8.7 in (221 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
12.4 in (315 mm)
Sidewall height
8.7 in (221 mm)
Wheel (rim) diameter
17.0 in (432 mm)
Overall diameter
34.4 in (873 mm)
Circumference
108.0 in (2742 mm)
Revolutions per mile
587

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

Which vehicles use LT315/70R17?

These vehicles list LT315/70R17 among their verified sizes, by trim. Open one to see all of its sizes.

Shop for LT315/70R17 tires

Confirm the size on your tire sidewall or door placard first. These links open each store's own search for LT315/70R17; prices and stock are on their sites.

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Snow chains and tire socks for LT315/70R17

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 LT315/70R17. Whether they suit your vehicle depends on its clearance and the local rules.

Snow chains for LT315/70R17 (Amazon search, opens in a new tab)Tire socks for LT315/70R17 (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 LT315/70R17. 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 LT315/70R17
SizeWheel diameterDiameter differenceCalculator
LT275/65R2020 in (different)-0.84%Compare LT315/70R17 with LT275/65R20
35x12.50R20LT20 in (different)+1.86%Compare LT315/70R17 with 35x12.50R20LT

Compare LT315/70R17 with similar sizes

Side-by-side dimensions and speedometer difference for sizes close to LT315/70R17 in overall diameter.

Compare LT315/70R17 with another size

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

Compare LT315/70R17 with another size

Questions about LT315/70R17

What does LT315/70R17 mean?

LT315/70R17 describes the shape and size of a tire, not how much it can carry or how fast it can go. 315 is the width in millimeters, 70 is the sidewall height as a percentage of that width (about 221 mm), R is the construction type and 17 is the wheel diameter in inches.

How tall is a LT315/70R17 tire?

A LT315/70R17 tire has a nominal overall diameter of about 34.4 in (873 mm), with a sidewall about 8.7 in (221 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 LT315/70R17 tire make?

About 587 revolutions per mile, based on a circumference of 108.0 in (2742 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 LT315/70R17?

Among the common sizes we list, these are within about 3% of the overall diameter of LT315/70R17: LT275/65R20 (-0.84%), 35x12.50R20LT (+1.86%). 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.