KSP 1.5 in Wheel Spacers 6x5.5 for Silverado Sierra 1500 - Forged Fit

In this review the KSP 1.5 in wheel spacers are evaluated for owners who want a reliable, hub-centric solution to widen wheel track on Chevy and GMC trucks and SUVs. The single biggest reason to buy is the construction: forged 6061 T6 aircraft aluminum with CNC machining and black anodizing gives a durable, precision part that installs cleanly and reduces the chance of vibration. The review focuses on fitment across 6x139.7 vehicles, build quality, and the practical details of installation and long-term use.

Key Features

• Fitment: Designed for 6x139.7 bolt pattern vehicles, the spacer fits many Silverado, Sierra, Tahoe, Suburban, Yukon and related models for confident compatibility.
• Material: Forged 6061 T6 aircraft aluminum construction offers greater strength and fatigue resistance compared with common cast spacers.
• Precision machining: CNC machined hole positions and dimensions ensure accurate alignment and a snug hub-centric seating for improved wheel stability.
• Corrosion resistance: Black anodized finish protects the aluminum from corrosion and preserves appearance over time.
• Hardware quality: Includes ISO/DIN grade 10.9-12.9 geomet studs and heat-treated SCM435 bolts to reduce breakage risk and improve safety.
• Complete kit: Supplied as a package of four forged spacers with thread locker and recommended torque guidance for easier installation.

Who It's For

This spacer is aimed at truck and SUV owners who need a factory-like fit for wheels on the 6x139.7 bolt pattern, including many Silverado 1500, Sierra 1500, Tahoe, Suburban and Yukon model years. It suits hobbyists and professional installers who prefer a forged aluminum solution with quality studs and corrosion protection.

Those who should look elsewhere include vehicles with different bolt patterns or hub bores, drivers who require more than 1.5 in of spacing, and buyers who insist on a guaranteed hub-centric conversion kit from the wheel maker rather than a universal spacer.

Pros & Cons

Pros

• High strength forged 6061 T6 aluminum construction reduces cracking compared with cast alternatives.
• CNC precision and 78.1 mm hub bore promote accurate fit and minimize vibration when installed correctly.
• Quality studs and heat-treated bolts improve durability and lower the chance of stud failure.
• Black anodize and included thread locker make the kit practical and corrosion resistant.

Cons

• Hub-centric performance received mixed feedback from some users, so precise hub centering may vary by wheel and hub combination.
• Included studs may be slightly long on some wheel/hub setups and might require trimming for full clearance.

Specifications

Bolt Pattern	6x5.5 (6x139.7 mm)
Spacer Thickness	1.5 in
Thread Pitch	M14x1.5
Hub Bore	78.1 mm (3.07 in)
Material	Forged 6061 T6 aircraft aluminum
Hardware	ISO/DIN 10.9-12.9 geomet studs, SCM435 heat-treated bolts
Package	Set of 4 forged spacers with thread locker

Our Verdict

The KSP 1.5 in forged wheel spacers are a solid value for owners of Chevy and GMC trucks and SUVs who need a durable, precision spacer for 6x139.7 hubs. The forged 6061 T6 construction, CNC machining and quality hardware make it a practical upgrade for improved track width and wheel clearance, though buyers should verify hub-centric fit with their specific wheels and be prepared to trim stud length if necessary.

Frequently Asked Questions

Will these spacers fit my Silverado 1500?
They fit Silverado 1500 models that use the 6x139.7 bolt pattern across the listed model years; confirm your bolt pattern and hub bore before purchasing.

Are these spacers hub-centric?
The spacers have a 78.1 mm center bore to provide hub-centric seating, but real-world hub-centric performance can vary with wheel center hole tolerances.

What torque should be used on the lug nuts?
Recommended torque is 85-95 ft/lbs; use thread locker as supplied and follow torque sequence for safe installation.