Mezue ahịrịokwu na-esonụ: TS9 bidoro na 1971 South African Grand Prix, Naanị otu chassis dị maka onye ọkwọ ụgbọ ala / onye nwe ya bụ John Surtees mana ọ lara ezumike nká na nsogbu gearbox. Ụgbọala nke abụọ dị maka German Rolf Stommelen maka Spain mana onye Germany lara ezumike nká na nsogbu nrụgide mmanụ na Surtees kwụsịrị nke iri na otu, Na Monaco Grand Prix Stommelen kwụsịrị nke isii na Surtees nke asaa. N'asọmpi Holland, onye England ahụ gbara onye nke ise, a chụpụrụ onye Germany ahụ n'asọmpi ahụ maka na ndị uweojii na-enye ya nsogbu ka ọ malite ịgba. Na French Grand Prix, Surtees bịara nke asatọ na Stommelen nke iri na otu. Derek Bell sonyeere Stommelen na Surtees For Britain. Bell lara ezumike nká na Stommelen kwụsịrị nke ise na Surtees nke isii, Na German Grand Prix, onye England ahụ kwụsịrị nke asaa na nke iri nke German. N'Austria, onye England ahụ kwụsịrị ịgba ọsọ n'ihi na injin ya mebiri emebi, onye Germany ahụ mechakwara nke asaa. Onye ọkwọ ụgbọala bekee Mike Hailwood sonyeere Stommelen na Surtees maka
Ọ gbara onye nke anọ n'asọmpị Italian Grand Prix. Stommelen lara ezumike nká site na ihe mberede mgbe ọ malitere na Surtees lara ezumike nká site na nkwarụ injin. Na Canada, onye England ahụ gbara onye nke iri na otu ma onye Germany ahụ kwụsịrị ịgba ọsọ n'ihi oke okpomọkụ. Mgbanwe abụọ sochiri, onye American Sam Posey nọchiri Stommelen na Hailwood laghachiri isonyere Surtees tupu United States Grand Prix. Hailwood gbara nke iri na ise, Surtees gbara nke iri na asaa ma Posey lara ezumike nká na nsogbu pistin.