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Radar
Radar DIMAX R8 PLUS 275/40R18
Radar DIMAX R8 PLUS 275/40R18
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/week
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Width:
18.00
(in)
Height:
10.83
(in)
Depth:
18.00
(in)
SKU:
Radardsc0457
$253.00
Lease-to-own for as low as
/week
Get Started
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The Radar DIMAX R8 PLUS in 275/40R18 ships free from ThreePiece.us, with Affirm financing available at checkout and fast delivery from a nationwide warehouse network.
What 275/40R18 means
In the size 275/40R18, 275 is the section width in millimeters (10.83 in), 40 is the aspect ratio — the sidewall stands 40% as tall as the tire is wide, or 110.0 mm (4.33 in) — R denotes radial construction, and 18 is the wheel diameter in inches. That works out to an overall diameter of about 26.66 inches, turning roughly 756 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 99 — a maximum load of 1,709 lbs per tire. The speed symbol Y corresponds to a maximum sustained speed of 186 mph.
Specifications
| Size | 275/40R18 |
| Service Description | 99Y |
| Load Index | 99 |
| Speed Rating | Y |
| Section Width (mm) | 275 |
| Aspect Ratio | 40 |
| Temperature Grade | TIRE RIM DIAMETER=18TIRE TYPE=UHPTRACTION=TREAD WEAR=TREAD DEPTH=UQTG=WARRANTY= |
Frequently asked questions
What does 99Y mean on the Radar DIMAX R8 PLUS?
99Y breaks down as load index 99 — rated for 1,709 lbs per tire — with a Y speed rating, good for a maximum sustained 186 mph.
Will 275/40R18 tires fit my vehicle?
Check the size molded into your current tire's sidewall or the tire placard inside the driver's door jamb — if it reads 275/40R18, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 275/40R18 tire in stock to compare options.
How fast does this tire ship?
Every order at ThreePiece.us ships free, with fast delivery from a nationwide warehouse network. Affirm financing is available at checkout.
Keep shopping
Shop all 275/40R18 tires, browse Radar tires, see every Radar DIMAX R8 PLUS size, or view all tires at ThreePiece.us.
- BRAND:
- Radar
- MODEL:
- DIMAX R8 PLUS
- SIZE:
- 275/40R18
- ASPECT RATIO:
- 40
- LOAD INDEX:
- 99
- SECTION WIDTH:
- 275
- SERVICE DESCRIPTION:
- 99Y
- SPEED INDEX:
- Y
- TEMPERATURE:
- TIRE RIM DIAMETER=18TIRE TYPE=UHPTRACTION=TREAD WEAR=TREAD DEPTH=UQTG=WARRANTY=
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