QA1 26A99-1 26 Series IMCA-Legal Steel Monotube Shock Absorber 9in Stroke 9C/1R Digressive

The QA1 26A99-1 is a one-piece, large-body steel monotube shock absorber from QA1's 26A Series — the IMCA-legal variant of the popular 26 Series. This shock features a sealed Hyperscrew configuration with gas pressure tuneability disabled per IMCA sanctioning body regulations, making it fully legal for IMCA-class racing right out of the box.

Built for circle track competition, this shock delivers 9 inches of stroke with a compressed length of approximately 15.10 inches and an extended length of 24.60 inches. It uses digressive deflective disc valving with a 9C/1R valving ratio for consistent, predictable damping response across a wide range of track conditions.

Key Features:

• 2-inch O.D. zinc-plated steel monotube body for durability and corrosion resistance
• IMCA-legal sealed Hyperscrew configuration — gas pressure only adjustable by QA1 or QA1 Authorized Rebuilders
• Digressive deflective disc valving — 9C/1R ratio for controlled, progressive damping
• 46mm large-bore piston for stable, consistent valving at all shaft velocities
• Centerless-ground, hard chrome-plated, gun-drilled piston rod eliminates rod flex
• Eye/Eye (Eyelet-Both-Ends) mounting configuration
• 9-inch stroke | 15.10 in. compressed | 24.60 in. extended
• Racer revalveable and rebuildable for long-term repeatability
• Can be mounted upside-down with no change in damping rate, reducing unsprung weight
• Premium proprietary shock oil formulation resists fade under race conditions
• 100% dyno tested and serialized
• Made in the USA
• Backed by QA1's 1-year warranty against defects in materials and workmanship

The QA1 26A Series monotube shock is a proven choice for circle track racers running modifieds, late models, super stocks, and other classes on both dirt and asphalt. Its one-piece steel body and race-proven construction deliver reliable, consistent performance whether used as a primary shock or a traction shock in demanding conditions.