Centerlock wheel
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A centerlock wheel is a type of automobile wheel in which the wheel is fastened to the axle using a single, central nut, instead of the more common ring of 4 or 5 lug nuts or bolts.
Rudge-Whitworth wire wheel and knock-off nut on a 1922 Vauxhall 25
Early 1960s Borrani wire wheel with knock-off hub, as used on Ferrari 250 models
Late 60s/early 70s Cromodora alloy wheel with knock-off hub, as used on Ferrari 365 GTB/4
Mid-80s Ferrari Testarossa fitted with centerlock wheels. While mechanically the hubs are the splined type as on earlier models, the fastening nuts are octagonal as mandated by safety regulations.
Porsche 911 (991)
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The Porsche 991 is the seventh generation of the Porsche 911 sports car, which was unveiled at the 2011 Frankfurt Motor Show on 15 September as the replacement for the 997. The 991 was an entirely new platform, only the third since the original 911 launched in 1963. Production of the 991 generation ended on December 20, 2019, with 233,540 units produced.
Porsche 911 (991.1) Carrera 4S
Porsche 911 (991) Carrera 4S Coupé
2012 Porsche 911 Carrera S
Porsche 991 Carrera Convertible