Radar Dimax R8 Plus

Radar Dimax R8 Plus 285/40ZR21

4.8(257 store reviews)
$275.96 each
$1,103.84 set
or 4 interest-free payments of $275.96 Shop Pay Klarna Afterpay interest-free when paid on time
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Fitment Guarantee Risk free
Package Options Save when you build a package
Authorized Dealer 100% brand new wheels
Category
UHP Summer
Load index
1092,271 lbs per tire
Speed rating
YUp to 186 mph
Know your tire

About the Radar Dimax R8 Plus

High-Performance Grip, Built to Last

Best forEnthusiast drivers seeking responsive handling and wet-weather confidence in performance passenger cars and high-performance SUVs during three-season use.

The Radar Dimax R8 Plus is a ultra-high-performance summer tire built for drivers who demand sharp handling and confident grip from their performance cars or high-performance SUVs. Its asymmetric tread pattern delivers precise steering response at elevated speeds, while strong wet and dry traction capability makes it a capable choice across a wide range of driving conditions.

An asymmetric tread layout optimizes high-speed handling stability, while four wide circumferential grooves evacuate water efficiently to lower hydroplaning risk. The silica-enhanced compound contributes both additional grip and extended tread longevity. The Dimax R8 Plus carries a 35,000-mile limited tread life warranty and is covered under Radar's Protect Program, which also includes workmanship, materials, and road hazard coverage.

The numbers

Specifications

Size & Dimensions
Brand Radar
Tire Model Dimax R8 Plus
Part Number DSC0161
Tire Size 285/40ZR21
Section Width 285
Aspect Ratio 40
Rim Diameter 21
Overall Diameter 30
Overall Width 11.2
Sidewall Black Side Wall
Performance
Speed Rating Y
Load Index 109
Load Range XL
Tread Depth 10.50
Ratings
Mileage Warranty Manufacturer's Warranty
Category
Tire Type Summer, Performance
Good to know

Questions about this tire

What does 285/40ZR21 109Y mean?

285 is the tread width in millimeters, 40 means the sidewall is 40% of that width, and R21 is the 21-inch rim it mounts on. 109 is the load index (2,271 lbs per tire), and Y is the speed rating (up to 186 mph).

Is the Radar Dimax R8 Plus a good tire for everyday driving?

Yes, the Dimax R8 Plus delivers a well-rounded everyday experience for performance vehicle owners, offering a composed, relatively quiet ride alongside strong wet and dry traction. The silica compound and asymmetric design balance grip with durability, making it a practical choice for daily use in a high-performance car or SUV.

Can I use the Dimax R8 Plus during winter or in snow?

The Dimax R8 Plus is a summer-category tire and is not Three-Peak Mountain Snowflake certified, meaning it is not rated for severe snow service. While its silica compound retains some flexibility in cooler temperatures, this tire is not recommended for use in icy or heavy-snow conditions — a dedicated winter tire is the safer choice for those situations.

How long should the Radar Dimax R8 Plus last?

Radar backs the Dimax R8 Plus with a 35,000-mile limited tread life warranty, provided the tires are properly maintained, rotated, and used as intended. Actual longevity will vary depending on driving style, road conditions, and vehicle alignment.

Is the Dimax R8 Plus a noisy tire at highway speeds?

No, the Dimax R8 Plus is designed to run quietly. Its tread pitch sequencing is optimized to minimize road noise, which is a notable feature for a UHP tire that also prioritizes high-speed handling performance.

Who manufactures the Radar Dimax R8 Plus, and where are they made?

The Dimax R8 Plus is produced by Omni United Pte. Limited, a Singapore-based company and the parent organization behind the Radar brand. Manufacturing takes place across several countries, including Singapore, Thailand, China, Taiwan, India, and Indonesia, depending on the specific size.

The brand

About Radar

Radar Tires, Inc. is a Texas-based company. It offers passenger and light truck tires under the Radar Tires and Patriot Tires brands.

Shop all Radar tires →

Vehicle Compatibility

Buying from TFS Wheels

Shipping, returns & guarantees

Authorized Dealer — 100% Brand New Wheels & Tires

TFS Wheels is an authorized dealer for every brand we carry. Every wheel and tire we ship is brand new, unused, and packaged in its original manufacturer's box. We never sell refurbished, demo, or return-stock product. All manufacturer warranties apply and our warehouse is staffed by people who only handle wheels and tires — no in-transit damage, no test-fits, no surprises.

Free Shipping (Lower 48)

Free shipping on every order — wheels, tires, and accessories — to the contiguous United States. No minimum order, no hidden fees.

Standard delivery is 4–7 business days; expedited is 1–4 business days. Orders placed before 1:00 PM ET typically ship the same day. We do not ship internationally or to PO boxes.

Fitment Guarantee

If a wheel or tire marked "Direct Fit" or "Aftermarket Fit" for your vehicle arrives and does not fit as expected, we cover both the restocking fee and return shipping. The same applies if the bolt pattern does not match — provided your vehicle information was submitted at checkout.

To qualify for the guarantee, enter your year, make, model, and submodel before placing the order.

Manufacturer's Warranty

Every wheel and tire is covered by the full manufacturer's warranty against defects in materials and workmanship. Coverage terms vary by brand — most cover structural integrity for the life of the wheel and finish for 1 to 2 years from purchase. If you ever have a warranty question, contact us first; we work directly with the manufacturer on your behalf so you don't have to.

Accessories Included with Your Order

When you submit your vehicle information at checkout, the right lug nuts and (if needed) hub-centric rings are automatically added to your cart in the correct sizes — no guessing, no separate ordering.

TPMS sensors are also available in the cart. We program each sensor to your vehicle's exact year, make, model, and submodel before shipping, so they arrive ready to sync with your truck or car the moment they're installed. This typically saves customers the dealer or installer's programming fees, which often run several dozen dollars per wheel.

Returns

Returns are accepted within 30 days of purchase on items in new, unused condition. A 25% restocking fee applies to general (change-of-mind) returns, and the buyer covers return shipping.

The restocking fee and return shipping are waived for incorrect items, transit damage, or fitment issues when vehicle information was provided at checkout. Single wheels, single tires, mounted items, special orders, and accessories (lug nuts, locks, hub-centric rings, TPMS sensors, installation kits) are final sale.

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Owner Reviews

What Happens After You Order

A specialist checks your fitment by hand before anything ships.