Write a Review
Michelin
Michelin Defender LTX M/S 255/55R18XL 109H - 98045
Michelin Defender LTX M/S 255/55R18XL 109H - 98045
📧 Get Fitment Help
Verify parts fit & get product recommendations
Lease-to-own for as low as
/week
Get Started
Guaranteed to Fit — confirm your size with the fitment checker on this page
Price Match Guarantee Learn More
Free Mount & Balance
Free Shipping
OUT OF STOCK 
📧 Get Fitment Help
Verify parts fit & get product recommendations
The Michelin Defender LTX M/S in 255/55R18 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.
What 255/55R18 means
In the size 255/55R18, 255 is the section width in millimeters (10.04 in), 55 is the aspect ratio — the sidewall stands 55% as tall as the tire is wide, or 140.2 mm (5.52 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 29.04 inches, turning roughly 694 revolutions per mile. Overall diameter is what matters for speedometer accuracy and clearance when you change sizes, so compare it — not just the width — against your current tire.
The service description on this tire decodes to a load index of 109 — a maximum load of 2,271 lbs per tire. The speed symbol H corresponds to a maximum sustained speed of 130 mph.
Load Range E corresponds to a 10-ply rating.
Specifications
| Size | 255/55R18XL |
| Tire Type | All Season |
| Service Description | 109H |
| Load Index | 109 |
| Speed Rating | H |
| Load Range | Extra Load |
| Section Width (mm) | 255 |
| Aspect Ratio | 55 |
| Overall Diameter (in) | 29 |
| Tread Depth (/32") | 10.5 |
| Treadwear | 720 |
| Traction Grade | A |
| Temperature Grade | A |
| UTQG | 720AA |
| Warranty | 70K |
Frequently asked questions
What does 109H mean on the Michelin Defender LTX M/S?
109H breaks down as load index 109 — rated for 2,271 lbs per tire — with an H speed rating, good for a maximum sustained 130 mph.
What kind of tire is the Michelin Defender LTX M/S?
The Michelin Defender LTX M/S in 255/55R18 is a all season tire.
What are the treadwear and warranty ratings on the Michelin Defender LTX M/S?
This tire carries a treadwear grade of 720, traction grade A, temperature grade A under UTQG. The manufacturer's warranty is 70K.
Keep shopping
Shop all 255/55R18 tires, browse Michelin tires, see every Michelin Defender LTX M/S size, or view all tires at ThreePiece.us.
- BRAND:
- Michelin
- Model:
- Defender LTX M/S
- Size:
- 255/55R18XL
- Aspect Ratio:
- 55
- Load Index:
- 109
- Load Range:
- Extra Load
- Section Width:
- 255
- Service Description:
- 109H
- Speed Index:
- H
- Temperature:
- A
- Tire Rim Diameter:
- 29
- Tire Type:
- All Season
- Traction:
- A
- Tread Wear:
- 720
- Tread Depth:
- 10.5
- UQTG:
- 720AA
- Warranty:
- 70K
PRODUCT REVIEWS (0)
Overall Rankings
Have you tried this product?
WRITE A REVIEWNo reviews for this product yet. Be the first to write a review!
Write a Review