TreadSize

Decoded sidewall size

185/55R15 tire size

185/55R15 in inches: 23.01" overall diameter — 7.28" wide, 4.01" sidewall.

Methodology: dimensions are calculated from standard ETRTO tire-size formulas. Last reviewed June 2026 by the TreadSize editorial team.

185/55R15 tire detail photo with TreadSize diameter, width, and rim measurement card
Overall diameter 23.01 in 584.5 mm
Section width 7.28 in 185 mm
Sidewall height 4.01 in 101.75 mm
Revs / mile 876 speedo calibration

Before you fit 185/55R15: verify the vehicle placard, load index, speed rating, wheel offset, and full-lock/full-compression clearance. Nominal dimensions do not guarantee a safe physical fit.

Compare this size

Full dimensions

Measurement Metric Imperial
Overall diameter 584.5 mm 23.01 in
Section width 185 mm 7.28 in
Sidewall height 101.75 mm 4.01 in
Rim diameter 381 mm 15 in
Circumference 1836.3 mm 72.29 in
Revolutions per mile 876.4
Aspect ratio 55%

NHTSA safety record for 185/55R15

Drawn from official U.S. government (NHTSA) consumer complaint and recall filings for this exact tire size — not the generic averages you'll find elsewhere.

Complaints on record 3 filed with NHTSA
Recalls on record 0 none on record

What owners report fails — 185/55R15

  • Blowout 2

These are unverified consumer reports and manufacturer recalls filed with the National Highway Traffic Safety Administration — not validated failure rates, and not adjusted for how many tires of this size are in service. Popular sizes naturally accumulate more reports. Use this as a research signal, not a verdict on any specific tire. Data as of 2021. Source: NHTSA Office of Defects Investigation (public domain). Always check the latest recalls at NHTSA.gov and report a tire problem if you have one.

How 185/55R15 compares inside the NHTSA size dataset

Complaint rank #218 of 271 among 271 safety-record sizes
Vs dataset median 7 below median 10 complaints
Top failure share 67% Blowout

This comparison is derived only from tire sizes that have a real NHTSA complaint or recall record in the TreadSize dataset. Source: NHTSA ODI — Consumer Complaints (FLAT_CMPL) + Recalls (FLAT_RCL), U.S. DOT public domain; Complaints through 2021.

Nearby safety records by complaint volume

120/70R17 3 complaints · 2 recalls 235/55R20 3 complaints · 2 recalls 305/65R17 3 complaints · 1 recalls 155/80R13 3 complaints · 0 recalls 165/25R15 3 complaints · 0 recalls 185/55R17 3 complaints · 0 recalls 195/95R15 3 complaints · 0 recalls 200/50R18 3 complaints · 0 recalls

Dataset download: JSON or CSV. Latest recall lookup: NHTSA.gov.

Related tire sizes

195/55R15 → 205/55R15 → 185/60R15 → 185/65R15 → 185/55R16 →
Decode another tire size →  ·  Compare two sizes →  ·  Plus sizing →

Frequently asked questions

What is the overall diameter of a 185/55R15 tire?

A 185/55R15 tire has an overall diameter of 23.01 inches (584.5 mm).

How tall is a 185/55R15 tire?

The sidewall height is 101.75 mm (4.01 inches), and the overall diameter from the ground to the top of the tire is 23.01 inches.

How many revolutions per mile does a 185/55R15 tire make?

A 185/55R15 tire makes approximately 876 revolutions per mile. Your speedometer is calibrated to this number.

What rim size does a 185/55R15 tire fit?

A 185/55R15 tire is designed for a 15-inch rim (381 mm).

Are there recalls or safety complaints for 185/55R15 tires?

NHTSA has 3 consumer complaints on record for the 185/55R15 size; the most reported issue is blowout (2 reports). These are unverified consumer reports, not validated failure rates, and are not adjusted for how many tires of this size are in service.

All dimensions calculated using standard ETRTO formulas. Always confirm fitment with your vehicle's door-placard and a qualified tire professional before purchasing.