TRAXXAS Unlimited Desert Racer Rear Spring Damper Set 139mm UDR139R by GPM  [UDR139R]

Aluminium rear shock upgrades for TRX UDR

This rear spring damper set is produced for the TRAXXAS Unlimited Desert Racer layout. The pair of aluminium rear dampers aims to cut internal friction and soak up impacts so the model maintains better balance during off-road running.

The upgrade specification increases coil wire from 1.8mm to 2mm while keeping compatibility with standard springs if a different rate is required, and ups the shock shaft from 3.5mm to 5mm to reduce bending under load. The cylinder body is aluminium and the spring retainer is formed to seal tightly to limit oil leakage in normal use.

These components are suitable where more robust rear damping is needed for rough surfaces and higher-speed desert use. Installation follows basic shock overhaul steps and tuning remains the same process using shock oil, springs and preload to set ride height and damping response.

For model builders seeking a firmer rear damping arrangement on the TRAXXAS UDR, these aluminium rear dampers deliver thicker shafts and springs while preserving familiar installation and service routines.