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DIAMONDHEAD

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Installed by Road Runner Wheels & Tires — family-owned in Marietta since 2010. Questions? Call (678) 400-6467.

About This Wheel

When you hold a DIAMONDHEAD, the first thing you notice is how intentional the face geometry is. The spoke structure has that angular, cut-edge character the name implies — nothing soft or meandering about it. At 9.50 inches wide on a 20-inch diameter, the proportions fill the wheel well on a Silverado 2500 or Sierra 2500 HD without looking stuffed in. The Satin Machined finish catches light differently depending on angle: the machined surfaces throw a directional glint while the satin field stays controlled and matte-ish. It reads well against white, black, silver, and the darker granite or onyx metallics GM has been running on these trucks.

Specifications

Diameter x Width	20" x 9.5"
Bolt Pattern	8x180
Offset	-12mm, +0mm
Hub Bore	124.30mm
Construction	Forged
Material	Aluminum alloy
Finish	SM
Manufacturer Part Number	Varies by size (pick a size above)

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1 Call 678-400-6467 to confirm fitment & availability
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678-400-6467 · Marietta, GA · Hablamos Español

Fitment

This wheel runs the 8x180 bolt pattern, which covers a range of half-ton trucks and SUVs depending on hub bore and offset. A hub-centric ring is recommended when the wheel hub bore is larger than the vehicle hub.

About the SM Finish

KG1 Forged focuses exclusively on flow-formed and fully forged construction, which means their manufacturing process is the product, not an afterthought. Forged wheels start as a solid billet and are shaped under extreme pressure, producing a denser grain structure than cast alternatives. That matters on heavy-duty applications where load ratings and long-term structural integrity aren't negotiable. KG1 has built a reputation in the HD truck space specifically by staying in their lane and engineering to the application.

About KG1 Forged

KG1 Forged produces wheels distributed nationally through trusted vendor channels. Catalogs are stocked, MAP-pricing is enforced, and warranty coverage is honored at the manufacturer level.

Installing at Road Runner Wheels & Tires

Mount and balance available in our shop. TPMS programming available on-site. Free fitment guidance. Same shop handles lift kits, suspension work, and full builds.

Questions We Get

Will this fit my truck?

Always confirm your specific trim and year against the fitment guide, and factor in any leveling kit or suspension lift when evaluating clearance at zero offset.

Do lug nuts come included?

Lug nuts are not included with the wheel. For 8x180 GM HD applications you'll need a seat style that matches your specific lug nut pockets — most OEM and aftermarket HD GM hardware uses a 14x1.5 thread pitch with a conical or mag seat depending on the wheel. We can confirm the correct seat type and point you to compatible hardware before your order ships.

Looking for wheels, rims & tires near you in the Atlanta metro? We mount + balance same day at our Marietta tire shop — 1585 Roswell Rd. Serving Marietta, Atlanta, Cobb County, Kennesaw, Smyrna, Sandy Springs, Roswell, Alpharetta, Buckhead + Vinings.

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