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185/65R15 tires: size explained

185/65R15

185/65R15 is a Euro-metric tire size. It is about 24.5 in (622 mm) tall, 185 mm wide, and made for a 15-inch wheel.

What 185/65R15 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.

No letterEuro-metric
With no letter in front of the width, this is a Euro-metric size (also called hard metric). It has the same dimensions as the P-metric version but is built to a different load standard, so its load capacity can differ.
185Section width
The tire's width is 185 millimeters (7.3 in), measured from sidewall to sidewall.
65Aspect ratio
The sidewall height is 65% of the width. For 185 mm that is about 4.7 in (120 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.
15Wheel (rim) diameter
The tire is made for a wheel 15 inches across. Its overall diameter is larger: about 24.5 in (622 mm).

185/65R15 dimensions

24.5 inOverall diameter: 24.5 in (622 mm)Rim diameter: 15.0 in (381 mm)Sidewall height: 4.7 in (120 mm)7.3 inSection width: 7.3 in (185 mm)Sidewall height: 4.7 in (120 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
7.3 in (185 mm)
Sidewall height
4.7 in (120 mm)
Wheel (rim) diameter
15.0 in (381 mm)
Overall diameter
24.5 in (622 mm)
Circumference
76.9 in (1952 mm)
Revolutions per mile
824

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

Which vehicles use 185/65R15?

These vehicles list 185/65R15 among their verified sizes, by trim. Open one to see all of its sizes.

Shop for 185/65R15 tires

Confirm the size on your tire sidewall or door placard first. These links open each store's own search for 185/65R15; prices and stock are on their sites.

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Snow chains and tire socks for 185/65R15

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 185/65R15. Whether they suit your vehicle depends on its clearance and the local rules.

Snow chains for 185/65R15 (Amazon search, opens in a new tab)Tire socks for 185/65R15 (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 185/65R15. 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 185/65R15
SizeWheel diameterDiameter differenceCalculator
195/65R1515 in (same)+2.09%Compare 185/65R15 with 195/65R15
205/55R1616 in (different)+1.67%Compare 185/65R15 with 205/55R16
225/45R1717 in (different)+2.06%Compare 185/65R15 with 225/45R17

Same dimensions, different load standard

P185/65R15 (P-metric) has the same dimensions as 185/65R15, but it is built to a different load standard. Check the load index on the sidewall rather than assuming the two are interchangeable.

Compare 185/65R15 with similar sizes

Side-by-side dimensions and speedometer difference for sizes close to 185/65R15 in overall diameter.

Compare 185/65R15 with another size

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

Compare 185/65R15 with another size

Questions about 185/65R15

What does 185/65R15 mean?

185/65R15 describes the shape and size of a tire, not how much it can carry or how fast it can go. 185 is the width in millimeters, 65 is the sidewall height as a percentage of that width (about 120 mm), R is the construction type and 15 is the wheel diameter in inches.

How tall is a 185/65R15 tire?

A 185/65R15 tire has a nominal overall diameter of about 24.5 in (622 mm), with a sidewall about 4.7 in (120 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 185/65R15 tire make?

About 824 revolutions per mile, based on a circumference of 76.9 in (1952 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.

Is 185/65R15 the same as P185/65R15?

They have the same dimensions: both are about 24.5 in (622 mm) tall and 185 mm wide. They are built to different load standards, though (Euro-metric and P-metric), so the load a tire can carry can differ. Check the load index on the sidewall, and ask a tire professional or your owner's manual before treating them as interchangeable.

Which sizes have a similar diameter to 185/65R15?

Among the common sizes we list, these are within about 3% of the overall diameter of 185/65R15: 195/65R15 (+2.09%), 205/55R16 (+1.67%), 225/45R17 (+2.06%). 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.