XRAY T4 4-Hole 1.1mm Composite Piston Set - Arrowmax AM-T4-308037A1  [AM-T4-308037A1]

T4-compatible composite pistons for steady damping

The Arrowmax AM-T4-308037A1 composite piston set includes four pistons designed as direct replacements for XRAY T4 shock assemblies. The 4-hole 1.1mm layout helps manage oil flow inside the shock body, making it suitable for tuning 1/10 touring and pan car damping.

These pistons are typically used to sharpen mid and high speed damping control and to regularise stroke feel by limiting how fast oil moves through the piston during compression and rebound. They work well for drivers who change oil grades and shock travel as part of setup routines.

Fitting follows standard T4 shock service steps: remove the cap and shaft, fit the piston onto the shaft using the correct retainer for your shock, then refill and bleed to clear air pockets. No specialised equipment is necessary beyond basic shock tools and a clean area to avoid oil contamination.

The composite material offers a balance of finish and wear resistance appropriate for race day and practice; inspect pistons regularly and replace in matched groups to maintain consistent performance on all four corners.