SYKRSS Wheel Spacers 12mm for Chevy Silverado / GMC Sierra 1500 — 6x139.7 to 6x5.5, 78.1mm Hub‑Centric

SYKRSS 12mm 6x139.7 wheel spacers widen your Silverado or Sierra 1500 track by 12mm using a precision 78.1mm hub-centric fit for improved stance and clearance.

These SYKRSS wheel spacers are a set of four CNC-machined 6061-T6 forged aluminum adapters designed to convert a 6x139.7 bolt pattern to 6x5.5 while maintaining a 78.1mm hub-centric bore. Built with rust-proof 10.9 grade studs and manufactured under IATF 16949:2016 standards, they’re intended to deliver a vibration-free fit for compatible Chevy and GMC trucks when factory lug bolts are reused.

How will 12mm spacers affect my truck’s handling and look?

Adding 12mm per wheel broadens the vehicle’s track width slightly, which can sharpen cornering feel and reduce some body roll by increasing lateral stability. Visually, the wheels sit a bit more flush with the fenders, giving a more aggressive, finished stance without major suspension changes.

• 12mm increased track width for subtle handling gains
• Flush wheel fitment for improved visual stance
• Can create space for larger calipers or aftermarket components

Are these spacers a precise fit for my Silverado or Sierra?

SYKRSS spacers are hub-centric with a 78.1mm bore matched to the listed vehicle hub sizes, designed specifically for Chevy Silverado 1500 (2019–2021) and GMC Sierra 1500 (2019–2021) including Sierra 1500 Limited (2022). The spacer set converts a 6x139.7 pattern to 6x5.5 while using M14x1.5 thread pitch, so confirm your truck’s year and bolt pattern before purchase.

• 78.1mm hub-centric bore for vibration reduction
• Converts 6x139.7 to 6x5.5 lug pattern accurately
• Matches M14x1.5 thread pitch used on compatible trucks

What materials and quality controls ensure safety and durability?

Each spacer is CNC-machined from aerospace-grade 6061-T6 forged aluminum for a consistent, strong core and finished with corrosion-resistant studs rated 10.9. SYKRSS production follows IATF 16949:2016 automotive quality standards, and the kit includes gloves and cleaning wire balls to prepare hubs for installation.

• 6061-T6 forged aluminum for strength and light weight
• Rust-proof 10.9 grade studs, precision-machined surfaces
• IATF 16949:2016 certified manufacturing process

How do I install these spacers and what tools are required?

Installation uses your truck’s factory lug bolts (bolts not included); the process is straightforward but torque accuracy is critical. SYKRSS supplies step-by-step instructions; basic tools include a torque wrench, socket set and breaker bar. Professional installation is recommended if you aren’t comfortable with wheel torque and hub prep.

• Reuses factory lug bolts — bolts NOT included
• Tools: torque wrench, socket, breaker bar
• Includes installation guide, gloves, and cleaning wire balls

Who this is for: These spacers suit Silverado and Sierra owners wanting a modest stance change, extra clearance for larger brake or suspension parts, or a hub-centric solution that minimizes vibration. Ideal buyers are drivers who confirm vehicle compatibility, have basic mechanical knowledge (or access to a trusted mechanic), and value certified manufacturing and lightweight forged aluminum construction.