ECCPP 3" Wheel Spacers 6x5.5 (6x139.7) 108mm Bore — 4pc Kit for Chevy/GMC Silverado 1500, Forged 6061‑T6 Aluminium

ECCPP 3" wheel spacers (4-piece set) adapt 6x5.5 bolt patterns with a 108mm center bore using forged 6061‑T6 aluminum, designed to push wheels outward for improved clearance and fitment on compatible Chevy/GMC trucks.

These ECCPP spacers are a full kit intended for many Chevrolet and GMC full‑size trucks and SUVs from the late 1990s through the mid‑2010s. CNC machined from aircraft‑grade 6061‑T6 billet aluminum and supplied with pressed studs and opened‑end lug nuts, the set is engineered for dimensional accuracy and corrosion resistance. The 3‑inch thickness addresses issues like brake caliper interference, tire clearance for wider rubber, and stance adjustments when using lift or lowering kits.

Will these spacers fit my vehicle and wheels?

Compatibility is specific: the spacers maintain a 6x5.5 (6x139.7mm) bolt pattern and a 108mm center bore, with M14x1.5 stud thread engagement. Fitment covers many models but you must verify stud length, bore size, and fender clearance before installation.

• Vehicle examples: Chevy Silverado 1500/Sierra 1500 (1999–2014), Yukon/Yukon XL 1500 (2000–2014), Avalanche (2003–2013), Astro (2002–2005).
• Wheel bolt pattern: 6x5.5 (6x139.7mm) to 6x5.5.
• Center bore: 108mm minimum; studs: 14x1.5 thread.
• Clearance check: require at least 3" between fender and tire for full offset.

How do these spacers improve wheel and brake clearance?

The 3" offset places the wheel farther from the hub, creating extra room for oversized tires and preventing contact with calipers or suspension components. They are useful when fitting wider wheels or altering backspacing for a wider track.

• Prevents rubbing between tire sidewall and inner fender or control arms.
• Allows installation of larger, high‑traction tires without trimming.
• Creates space for aftermarket brake calipers or suspension hardware.
• Helps achieve a wider stance for improved visual presence and fitment.

What materials and hardware come with the ECCPP spacer kit?

The kit is built from forged 6061‑T6 aluminum for strength-to-weight efficiency and CNC precision for consistent fit. ECCPP supplies the necessary studs and opened‑end lug nuts so you receive a complete installation package.

• Forged 6061‑T6 aircraft‑grade aluminum construction with corrosion‑resistant finish.
• 32 machined, pressed‑in studs for secure wheel mounting.
• Opened end lug nuts included for wheel attachment.
• CNC machining for tight dimensional tolerances and repeatable fitment.

Are there installation or garage checks I should perform?

Before installing, verify threads, stud lengths, and available fender clearance. Follow suggested torque values and inspect the hub and wheel mating surfaces for a flush fit to reduce vibration risk.

• Confirm wheel studs are 14x1.5mm and that stud length accommodates a 3" spacer.
• Measure at least 3" of fender-to-tire clearance for the chosen tire/wheel combo.
• Ensure wheel center bore is not smaller than 108mm; torque lug nuts to 85–90 ft‑lbs.
• Trim or replace factory studs if they protrude excessively before use.

Who is this for? The ECCPP 3" 6x5.5 wheel spacer kit suits truck and SUV owners who need extra clearance for wider tires, aftermarket brakes, or altered suspension geometry. It’s aimed at DIY installers and professional shops working on Chevy/GMC Silverado, Sierra, Yukon, Avalanche, and compatible models seeking a complete, forged‑aluminum spacer solution that comes with the required hardware for installation.