Editing Hubcap (section)

=== Motorsport use ===
[[File:Porsche 956 962 (935?) tires and wheels (7526211220).jpg|thumb|right|1980s BBS racing wheel shroud]]

Another variant of the wheel cover, known also as ''wheel shrouds'', ''rim blanking'' or ''turbofans'', is associated with the German wheelmaking brand [[BBS Kraftfahrzeugtechnik|BBS]] since the 1970s. These are attached to the wheel first, then bolted on as if the driver or mechanic is bolting the wheel to his car in the manner of changing their wheel. Commonly made from aluminum, they are designed to distribute airflow to the brakes, thereby generating downforce depending on the shape. Thus, these wheel covers are functional rather than merely decorative.<ref>{{Cite web |last=Productions |first=Petrolicious |date=2016-07-07 |title=This Is How Turbofan Wheels Evolved From Racing To The Street |url=https://petrolicious.com/articles/this-is-how-turbofan-wheels-evolved-from-racing-to-the-street |access-date=2024-01-15 |website=Petrolicious |language=en}}</ref>

From [[2006 Formula One season|2006]], to get around FIA technical regulations that ''all wheels must be made from an homogeneous metallic material'', a [[carbon fiber]] variant found its way into [[Formula One]] when it was used by [[Scuderia Ferrari]] whom BBS supply its wheels to. At the [[2006 Turkish Grand Prix|Turkish Grand Prix]], the rear shrouds were also adopted by Toyota and Toro Rosso and thus their use became widespread for all teams. Prior to being banned from the [[1994 PPG Indy Car World Series]], wheel shrouds were popular on [[Oval track racing|superspeedways]] until [[Team Penske]] revealed that those covers could reduce drag by 2.5%.<ref>{{cite web|url= http://www.motorsportads.com/race-engine-technology/ret-formula-one-technology.htm#wheelshrouds |title=Race Engine Technology: Formula One Technology |website=motorsportads.com |archive-url= https://web.archive.org/web/20160617010215/http://www.motorsportads.com/race-engine-technology/ret-formula-one-technology.htm#wheelshrouds |archive-date=17 June 2016|url-status=dead |access-date=28 November 2020}}</ref><ref>{{cite web|url= https://www.racecar-engineering.com/articles/f1/wind-cheaters-10-ways-f1-teams-increase-top-speed/ |title=Wind Cheaters - 11 ways F1 teams increase top speed (Updated) |last=Collins|first=Sam |date=9 June 2013 |work=Racecar Engineering |access-date=25 April 2023}}</ref>

Another type of wheel cover, the ''static wheel fairing'', was introduced by BBS for Ferrari at the [[2007 British Grand Prix|British Grand Prix]] to act as a brake cooling aid for front wheels while remaining stationary the wheel itself with one part being cut out at a 27° angle to enable hot air to escape and thus became adopted by every team. The wheel covers were banned from use in F1 from the [[2010 Formula One season|2010]] season after incidents where they broke loose in races. To get around the ban, Ferrari used a detachable integral aero device made from the same magnesium material as the wheel itself, which consisted of double concentric rings of different diameters. As parts of cars now have to be homologated, its rivals were unable to copy this device. Its use became eliminated when the FIA revised the regulations for [[2011 Formula One season|2011 season]] to prohibit wheel materials in certain exclusion zones.<ref>{{cite web|url= http://www.formula1-dictionary.net/wheel_shrouds.html |title=Wheel shrouds and Static wheel fairing |website=formula1-dictionary.net |access-date=28 November 2020}}</ref>