Abstract: Bicycle chainset comprising: two cranks (4,5) each comprising, at one end, means (7) for fastening a pedal, a main axle, of axis x-x?, coupled in rotation to the two cranks (4, 5) and intended to be fitted into a bottom bracket (3) of a bicycle frame (2), and at least one toothed chainring (8) rotated by the cranks (4,5). The chainset comprises, furthermore, universal adaptor means (15) for the chainring (8) that are rotated by the cranks (4,5) and that enable the chainring (8) to be positioned and removed by interlocking.