Today I have tried to make a car wheel with profile. Thanks to Pablo for this wonderful inspiration. 
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torus, then a profil
I have mirrored the profile (object > mirror > interactive mirror along the y axis)
selecting the empty, then: shift +s > 2
rotating the profile along the y axis
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crtl + j
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array modifier (object empty)
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adding some subsurf, adding some loopcuts to sharpen the shape
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control of the faces (face orientation in the overlays)
finished. 
maybe