TRAXXAS Unlimited Desert Racer Rear Dampers 139mm UDR139R by GPM  [UDR139R]

Aluminium-bodied rear dampers for TRX UDR

This rear spring damper pack is specified for the TRAXXAS Unlimited Desert Racer chassis. The set supplies two aluminium rear dampers that aim to cut internal friction and better absorb impacts, helping the car stay balanced during off-road running.

The upgrade path is straightforward: spring wire is boosted from 1.8mm to 2mm while remaining compatible with standard springs if you want a different rate, and shock shafts are increased from 3.5mm to 5mm to reduce the risk of bending under heavy loads. The cylinder uses aluminium and the spring retainer is built to seat tightly to reduce oil seepage in service.

These parts are chosen where firmer rear damping is needed for rough terrain and faster desert runs. Installation needs basic shock strip and rebuild, with tuning performed by changing shock oil, springs, and preload to dial in ride height and damping behaviour.

For hobbyists wanting a tougher rear damping setup on the TRAXXAS UDR, these aluminium dampers give heavier shafts and springs while keeping maintenance and tuning familiar.