Adjustable Triumph 400 Shock Setup Guide

Shock Absorber Adjustment Guide

This shock absorber offers three external adjustments:

• Spring preload
• Rebound damping
• Shock length

These settings allow you to adapt the shock to the rider’s weight, riding style, and the motorcycle’s geometry.

1. Spring Preload

The spring preload is adjusted using the threaded collars on the spring.

Purpose:
It adjusts the initial tension on the spring and helps set the correct rear sag depending on rider weight, passenger load, and riding conditions.

Effect:

• More preload = firmer rear end, less sag, higher ride height
• Less preload = softer rear end, more sag, lower ride height

Recommendation:
Preload should always be adjusted first, before changing any damping setting.

2. Rebound Damping

The rebound adjuster is located at the bottom of the shock and is marked H → S.

Purpose:
This setting controls how fast the shock returns after being compressed.

Adjustment direction:

• H (Hard) = slower return
• S (Soft) = faster return

Symptoms:

• If the rear feels bouncy or unstable after a bump, the rebound may be too soft
• If the rear feels harsh or does not recover properly between bumps, the rebound may be too hard

Recommendation:
Start from the middle position, then adjust gradually according to riding feel.

Important Notice About the Allen Screw

There is also an Allen screw / hex socket plug on the shock body. This is not an external adjustment and must not be opened by the user.

Purpose:
On this type of shock, this plug is used during professional servicing. It is typically part of the rebuild process to service the internal hydraulic circuit, including operations such as:

• refilling or bleeding the shock oil
• removing air from the damping circuit
• restoring proper internal damping performance during servicing

On some shock designs, professional servicing may also include additional internal work such as nitrogen recharge, depending on the construction of the shock.

Important:
Opening this plug does not provide a normal user adjustment. It is reserved for suspension professionals only. Incorrect handling can cause oil leakage, loss of damping performance, internal air contamination, or shock failure.

Recommended Adjustment Order

1. Set the spring preload according to rider weight
2. Adjust rebound damping

Summary

• Preload = sets spring tension and sag
• Rebound = controls return speed after compression
• Length = adjusts rear ride height and geometry

This shock does not have an external compression adjustment.