XRAY 303848 1.8mm Rear Sway Bar for X4 and X4F  [XR-303848]

Technical Brief: X4/X4F Rear Bar

This XRAY 303848 rear anti-roll bar is built for use with X4 and X4F rear suspension arms in an above-arm mount configuration. At 1.8mm thickness it is aimed at tuning rear roll stiffness for touring-style chassis.

Ball-bearing rotation points reduce friction and give repeatable movement during suspension travel. The bar uses a screw-linked height adjuster for fast setup swaps, and laser-engraved stripes on the bar make thickness identification straightforward.

From a setup perspective, increasing rear bar thickness raises rear roll resistance and can make the chassis feel firmer in roll, while thinner bars soften rear response. Adjust incrementally and compare lap times to dial in the correct balance.