Decoded sidewall size
245/40R20 tire size
245/40R20 in inches: 27.72" overall diameter — 9.65" wide, 3.86" sidewall.
Methodology: dimensions are calculated from standard ETRTO tire-size formulas. Last reviewed June 2026 by the TreadSize editorial team.
Before you fit 245/40R20: 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 sizeFull dimensions
| Measurement | Metric | Imperial |
|---|---|---|
| Overall diameter | 704 mm | 27.72 in |
| Section width | 245 mm | 9.65 in |
| Sidewall height | 98 mm | 3.86 in |
| Rim diameter | 508 mm | 20 in |
| Circumference | 2211.7 mm | 87.07 in |
| Revolutions per mile | 727.7 | |
| Aspect ratio | 40% | |
NHTSA safety record for 245/40R20
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.
1 tire recall on record affecting 245/40R20
- NHTSA 18T001000 · 2018 VOGUE SIGNATURE V Missing TIN information can make it difficult for owner to identify the tire in the event of a recall, potentially increasing the risk of driving with a recalled tire which could r
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.
Recall timeline for 245/40R20
NHTSA campaigns affecting this tire size, grouped from the local recall dataset. Exact owner-notification dates are not stored here; open the campaign at NHTSA for current remedy details.
How 245/40R20 compares inside the NHTSA size dataset
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
Dataset download: JSON or CSV. Latest recall lookup: NHTSA.gov.
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Frequently asked questions
What is the overall diameter of a 245/40R20 tire?
A 245/40R20 tire has an overall diameter of 27.72 inches (704 mm).
How tall is a 245/40R20 tire?
The sidewall height is 98 mm (3.86 inches), and the overall diameter from the ground to the top of the tire is 27.72 inches.
How many revolutions per mile does a 245/40R20 tire make?
A 245/40R20 tire makes approximately 728 revolutions per mile. Your speedometer is calibrated to this number.
What rim size does a 245/40R20 tire fit?
A 245/40R20 tire is designed for a 20-inch rim (508 mm).
Are there recalls or safety complaints for 245/40R20 tires?
NHTSA has 0 consumer complaints on record for the 245/40R20 size and 1 recall. 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.