Suspension Control Arm Spacer

What Are Suspension Control Arm Spacers?

Suspension control arm spacers are precisely machined components that fit between a control arm and its mounting point on the frame, subframe, or spindle. By shifting the control arm's position — even by a few millimeters — these spacers allow enthusiasts and technicians to fine-tune critical suspension geometry parameters such as camber, caster, and toe. The result is better tire contact, more predictable handling, and reduced uneven tire wear.

Why Control Arm Spacers Matter

Every vehicle leaves the factory with suspension geometry engineered for stock ride height and stock tires. The moment you lower your car, lift your truck, install wider wheels, or upgrade to stiffer springs, that factory geometry goes out the window. Control arm spacers are one of the most targeted, cost-effective tools for dialing geometry back into spec — or intentionally tuning it beyond spec for track performance.

Beyond geometry correction, control arm spacers also play a role in eliminating unwanted lateral movement in the control arm itself. A properly shimmed arm moves predictably through its range of motion, which translates directly to a more connected feel at the steering wheel and more consistent braking behavior. For performance builds, even small improvements in suspension consistency can make a meaningful difference in lap times or autocross scores.

Key Considerations When Shopping Control Arm Spacers

• Material: Quality spacers are typically CNC-machined from billet aluminum or steel. Aluminum spacers offer a great strength-to-weight ratio, while steel spacers are preferred in high-load or off-road applications.
• Thickness/Offset: Spacers come in a range of thicknesses. Know your current alignment readings and your target specs before selecting a thickness — incremental adjustments are always safer than large jumps.
• Vehicle Fitment: Control arm mounting geometry varies significantly between platforms. Always verify fitment by year, make, model, and suspension configuration before purchasing.
• Hardware Inclusion: Some spacer kits include all necessary fasteners and hardware, while others require reuse of factory hardware. Confirm what's included to avoid delays during installation.
• Application: Whether you're correcting alignment after a lowering spring install, building a dedicated road-race car, or leveling a truck, make sure the spacer is rated and designed for your specific use case.

Top Brands in Suspension Control Arm Spacers

When it comes to quality and fitment precision, a handful of brands consistently lead the category. UMI Performance is the top-selling name in this space, renowned for their American-made suspension components engineered specifically for GM muscle cars and performance vehicles. Their control arm spacers are designed to work seamlessly within complete suspension upgrade systems, making them a go-to for builders who want parts that play well together.

BMR Suspension is another respected name among performance enthusiasts, particularly in the Mustang, Camaro, and GM F-body communities. BMR's control arm spacers are engineered with a focus on measurable handling improvements, and their products are frequently found on road-race and autocross builds where precise geometry is non-negotiable.

Upgrade Your Suspension Geometry Today

Whether you're correcting alignment drift after a suspension modification or building a track-ready machine from the ground up, the right control arm spacer can make a surprisingly large difference in how your vehicle behaves. Explore the full selection of suspension control arm spacers to find the exact fitment and offset your build demands.