Replacement roller assemblies are what TradeBase carries to suit Alspec® heavy aluminium sliding doors — three of them, all high load. Two are 90kg tandem assemblies at 90mm, one of which also covers Capral™, Ullrich®, G.James® and Vantage™ assemblies; the third is a 150kg quad roller assembly at 150mm with the same cross-brand fitment. Nothing else appears here, and that is the point: on doors this size it is the roller assembly that fails, not the frame. Bearings pick up grit and grind, wheels flatten under the weight of a large glazed panel, and the door starts to drag or lift in the track. The millimetre figure in each title is the identifying dimension — the length of the assembly body — so measure the old assembly once it is out and count the wheels, because a tandem and a quad are not interchangeable.

Trademark notice: Alspec® is a trademark of its owner. TradeBase Australia is an independent supplier of replacement hardware and is not affiliated with, endorsed by or authorised by the brand owner. Brand and model names appear on this page only to identify the windows and doors our parts are made to fit. Unless a listing states otherwise, the parts shown are aftermarket replacements manufactured to suit — not genuine Alspec® parts.