The Avid 12mm Hex Track Width Spacers are a great way to adjust the width on any car using 12mm hexes with 5mm axles or less without having to change out your hubs. In other words, any modern offroad or onroad vehicle (ie: AE B5, TLR SCTE, and Xray T4). Typically this will help stabilize a vehicle by increasing track width and scrub.