QA1 5Q75-500R 5Q Series Twin Tube Circle Track Shock, Bearing Mount, 7in. Stroke, 5C/500R Rebound Adjustable

The QA1 5Q75-500R is a large body steel, twin tube, rebound adjustable circle track shock absorber featuring a bearing mount configuration with a 7-inch stroke. Valved at 5C/500R, this shock includes a rebound-adjustable piston rod, allowing racers to fine-tune valving directly at the track without requiring a full teardown.

Formerly marketed as the 51 and 53 Series, the 5Q Series represents QA1's updated large-body steel shock platform, available in both bearing mount and stock mount configurations. The 5Q75-500R is built with a focus on in-field tunability and ease of maintenance, making it a go-to choice for circle track competitors.

Key Features:

• Rebound Adjustable: Piston rod design allows on-track rebound valving adjustments — no shop required
• Twin Tube Design: Delivers consistent feel and grip across varying track conditions
• Rebuildable & Re-Valvable: Can be disassembled, re-valved, and rebuilt in minutes using basic tools
• Two-Piece Body: Simplifies disassembly and reassembly for faster maintenance turnaround
• Hyper Screw Port Gland: Relief cuts and hyper screw port design make filling and bleeding on assembly straightforward
• Upgraded Seal Kit: Minimizes leaks, especially critical in high-rebound applications
• Slip Fit Compression Tube: Simplifies the rebuild process
• Laser-Engraved Closure Nut: Black-anodized nut with engraved serial numbers and valving info for easy identification at the track or in the shop
• Black Zinc Coating: Provides a consistent finish and tight seal
• Scalloped Base Loop: Increases clearance in tight mounting areas such as upper control arms and shock mounts
• Raw Aluminum Pistons: Minimizes performance variations associated with anodized piston parts
• Coil-Over Compatible: Steel body shocks can be used in coil-over configurations with appropriate kits (sold separately)
• Bleed Shim Tunable: Valve with bleed shims or drill out bleeds to maximize tunability

The QA1 5Q75-500R is a purpose-built circle track shock designed for serious racers who demand in-field adjustability and long-term serviceability. Rebuild kits and tuning kits are available separately to keep this shock performing at its best season after season.