TRAXXAS TRX4 Outer Portal Drive Housing Brass Heavy Edition 18pcs by GPM TRX4021XB  [TRX4021XB]

Brass outer portal housing for TRX4

This is an RC-scale brass outer portal drive housing designed for TRX4 platforms, supplied as an 18pcs set. The component is intended to change wheel-end mass and alter crawling behaviour on scale trails. It is a drop-in style outer housing that works with portal hub assemblies and uses the included stainless steel cap head screws for attachment.

Material and role: the housing is brass, which increases unsprung/wheel-end weight compared with stock alloy or plastic housings, a change often used to improve grip and low-speed crawl stability on uneven terrain. The product description supplied with the item reports increased wheel weight values; users should treat those figures as manufacturer-provided notes and verify on their build scales where needed.

Fit and installation: the outer diameter of the housing is specified as 43mm, and the product requires an inner wheel opening larger than 43.5mm for proper installation. Check wheel inner diameter and hub clearance before fitting. The set includes the fasteners required for mounting, so confirm screw lengths and thread engagement are correct for your axle and hub stack during install.

Before fitting, confirm wheel inner bore exceeds 43.5mm and verify the included 2.5mm screws suit your hub stack; weigh and test one side first to evaluate handling changes prior to full installation.