Xray X4 Series Narrow Split Upper Deck Std Rear - Graphite 2.0 by Factory Pro O-XCP028  [FP-O-XCP028]

Rear narrow split upper deck

This Factory Pro replacement upper deck is an RC-scale rear upper deck designed for the Xray X4 Series chassis, offered in a Graphite 2.0 variant to provide a change in local stiffness for rear-end setup work. The part is targeted at hobbyists who tune chassis balance and tyre bite by adjusting rear upper deck stiffness and load paths rather than for general component replacement.

Fitment and role: the component occupies the rear upper deck position on X4 Series layouts and functions as a tuning element for rear chassis rigidity. When swapped in, it alters how the rear suspension and chassis respond under cornering and acceleration, allowing incremental setup changes without altering suspension geometry.

Installation notes: install using the original mounting points on the X4 rear upper deck, verify alignment with existing holes and clearances before tightening, and use the same hardware pattern as the stock part. Keep fasteners snug and recheck after the first run to ensure no shift in alignment affects handling.

Tuning guidance: use this Graphite 2.0 deck to increase localized rear stiffness for tracks that require more stable high-speed behaviour or to fine-tune rotation characteristics by combining different front and rear upper deck materials. Expect changes at the chassis level rather than direct changes to individual suspension components.