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Mastercraft
Mastercraft MSC Courser HTR Plus 255/55R18/XL
Mastercraft MSC Courser HTR Plus 255/55R18/XL
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Looking for a 255/55R18 touring tire? The Mastercraft Courser HTR Plus is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.
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 manufacturer lists the overall diameter of this specific tire as 18 inches — when clearance is tight, go by the published figure rather than the nominal size math.
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 T corresponds to a maximum sustained speed of 118 mph.
Specifications
| Size | 255/55R18/XL |
| Tire Type | Touring |
| Service Description | 109T |
| Load Index | 109 |
| Speed Rating | T |
| Load Range | XL |
| Section Width (mm) | 255 |
| Aspect Ratio | 55 |
| Overall Diameter (in) | 18 |
| Tread Depth (/32") | 12 |
| Treadwear | 460 |
| Traction Grade | A |
| Temperature Grade | B |
| UTQG | 460AB |
Frequently asked questions
What kind of tire is the Mastercraft Courser HTR Plus?
The Mastercraft Courser HTR Plus in 255/55R18 is a touring tire.
What are the treadwear and warranty ratings on the Mastercraft Courser HTR Plus?
This tire carries a treadwear grade of 460, traction grade A, temperature grade B under UTQG.
What does 109T mean on the Mastercraft Courser HTR Plus?
109T breaks down as load index 109 — rated for 2,271 lbs per tire — with a T speed rating, good for a maximum sustained 118 mph.
Keep shopping
Shop all 255/55R18 tires, see every Mastercraft Courser HTR Plus size, or view all tires at ThreePiece.us.
- BRAND:
- Mastercraft
- Model:
- MSC Courser HTR Plus
- Size:
- 255/55R18/XL
- Aspect Ratio:
- 55
- Load Index:
- 109
- Load Range:
- XL
- Section Width:
- 255
- Service Description:
- 109T
- Speed Index:
- T
- Temperature:
- B
- Tire Rim Diameter:
- 18
- Tire Type:
- Touring
- Traction:
- A
- Tread Wear:
- 460
- Tread Depth:
- 12
- UQTG:
- 460AB
- Warranty:
- N/A
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