X4F Rear Carbon Upper Clamp Lightweight Balance Upgrade - 301558 XRAY  [XR-301558]

Lightweight rear upper clamp for X4F

This RC-scale rear upper clamp is engineered to reduce unsprung mass at the rear and to move effective weight bias forward to influence handling. The clamp integrates the rear body post holder into a single carbon part, keeping the mounting footprint compact while retaining adjustability through the compatible flex bulkheads.

The part is CNC-machined from high-grade carbon fiber sourced and processed under controlled manufacturing, providing dimensional accuracy for repeatable setup changes. It is supplied as a set of 2 pcs and is intended for installation where the X4F rear upper clamp is required.

Practical tuning role: replacing the stock rear upper clamp with this lighter carbon unit lowers rear mass and shifts balance, which can be used to fine-tune rear grip, rotation and mid-corner response when adjusting suspension and flex settings on RC touring car setups.

Use this clamp as a targeted tuning option to alter rear-end behavior without changing suspension geometry, noting that tuning results depend on the whole chassis setup and track conditions.