ECCPP 1in Hubcentric Wheel Spacers 5x4.75 to 5x4.75 - Improved Stance

In this review of the ECCPP 1in hubcentric wheel spacers the bottom line is simple: these spacers are for drivers who need a reliable, lightweight way to push wheels outward for clearance or a wider track. The reviewer found them most useful for classic and late model GM cars listed in the fitment, where the main reason to buy is the precise hubcentric fit and durable T6 billet aluminum construction that keeps wheels centered without adding excessive unsprung weight.

Key Features

• Fitment: Designed to match 5x4.75 bolt patterns for many GM models, offering a direct mechanical match when fitment checks out.
• Thickness: The 1in (25mm) spacer provides consistent wheel offset gain that helps clear brakes or suspension components and gives a more aggressive stance.
• Material: Machined from T6 billet aluminum for a balance of strength and low weight compared with steel alternatives.
• Hardware: Preinstalled hardened 10.9 grade bolts provide secure clamping and reduce the number of loose parts during installation.
• Hubcentric design: The 70.5mm inner diameter centers the wheel on the spacer, improving wheel alignment to the hub and reducing vibration risk.

Who It's For

This product is best for owners of compatible GM vehicles who need a modest, hubcentric increase in track width, including owners of S15, Jimmy, Corvette and older Buick and Pontiac models listed in the fitment. It is particularly useful when fitting larger tires or different wheel offsets that otherwise would rub the sway bar or inner fender.

Drivers who should look elsewhere include those whose wheels or hubs do not meet the required 70.5mm bore or 12x1.5 wheel stud thread, and anyone who needs a spacer thicker than 1in or a different bolt pattern; professional wheel fitment verification is recommended before purchase.

Pros & Cons

Pros

• Good build quality with precise machining that customers report fits well on Corvette and other GM wheels.
• Lightweight T6 aluminum construction avoids adding excessive unsprung mass compared with steel alternatives.
• Hubcentric design and preinstalled 10.9 grade bolts simplify installation and reduce vibration concerns.

Cons

• Requires verification of stud thread size and center bore; buyers must ensure studs are not too long or bore is not too small.
• One size only (1in) limits flexibility if a different offset is required for a specific application.

Specifications

Our Verdict

The ECCPP 1in hubcentric spacer is a practical, value-oriented choice for compatible GM owners who want a safe, lightweight way to correct wheel fitment or achieve a wider stance. With solid materials, hubcentric design and positive user feedback on fit and appearance, it offers good value when buyers confirm stud threads and center bore compatibility first.

Frequently Asked Questions

Will these fit my Corvette?
They are listed as compatible with many Corvette model years but you must confirm your wheel center bore is at least 70.5mm and your studs are 12x1.5.

Are the bolts included?
Yes, the spacers come with preinstalled hardened 10.9 grade bolts so no separate hardware is required for mounting the spacer to the hub.

Do these cause vibration?
When used with matching hubcentric bore and correct stud threads, the hubcentric design helps prevent vibration; improper bore or stud length can cause problems so verify fitment before installation.