Adjustable Poly Bump Kit

The ALLSTAR PERFORMANCE Adjustable Poly Bump Kit (ALL 64505) is a precision shock absorption system designed for race vehicles and high-performance suspension applications where suspension bottoming needs to be controlled without adding excessive stiffness to the system. This polyurethane bump stop assembly uses adjustable packers to fine-tune the compression characteristics, allowing teams to dial in the exact engagement point for their specific suspension setup and track conditions.

The kit features a 2-inch outside diameter tree-style design standing 3 inches tall, constructed from polyurethane with a black finish for durability and corrosion resistance. Included 1/16-inch thick packer shims allow competitors to adjust bump stop compression rates without replacing the entire component—critical for race teams making mid-session setup changes during qualifying rounds or heat races. The shock mount interface ensures compatibility with standard suspension architectures across multiple vehicle platforms, while the polyurethane material absorbs impact energy more progressively than traditional rubber, reducing jarring loads transferred to the chassis.

This bump stop kit is essential for short-track racers, drag racing teams, and off-road competitors who need repeatable suspension geometry control. Adjustable bump stops prevent excessive chassis drop at full suspension compression while maintaining compliance during normal travel, protecting components like engines, transmissions, and fuel cells from damage. The modular packer system eliminates downtime—teams can experiment with different rates without ordering replacement parts, streamlining setup optimization between events.

ALLSTAR PERFORMANCE has established itself as a manufacturer of precision race hardware trusted by circle-track and drag racing programs. The Adjustable Poly Bump Kit reflects that focus on adjustability and durability, offering the kind of granular tuning capability expected in competitive motorsports environments where suspension setup directly impacts lap times and reliability.