Abstract: The invention relates to a battery (1) for electric bicycles comprising a total number N of cells (2) distributed in an optimized way, a management system (4) and at least one connector (5). The battery (1) is characterized in that it comprises a distribution with at least one additional semi-block (3b), created by at least one cell (2) separated from a block (3) or semi-block (3a) at one end (1a) of the battery (1), creating at least two spaces (6, 7). The previous space (6) is located in the semi-block (3a) of the end (1a) of the battery (1) created by the absence of at least one cell (2) and intended to connect the management system (4), and the new space (7) is in the additional semi-block (3b) created by the absence of at least a number n?1 of cells (2) and destined to house the connector (5).

Abstract: A bottle holder for an external battery which comprises a longitudinal base designed to be fitted to a tube of the frame of an electric bicycle. Where the bottle holder comprises a main body attached to the base and the main body and the base partially form a cavity intended to house an external battery or a water bottle.The main body is also capable of adapting the size of the cavity in such a way as to accommodate the external battery with a non-circular section and larger than the water bottle section, and furthermore, the main body comprises an adjustment mechanism for closing the cavity holder and preventing the external battery from moving around inside the holder. In this way, the invention allows the user to be able to house an external battery or a water bottle using one single holder without changing different holders.

Abstract: Bicycle frame, of the type which consist of a diagonal tube (1) of quadrangular section, in which at least in the mid-upper zone (11) of the diagonal tube (1) which faces the bicycle wheel, the outer side (10) of said quadrangular section is concave, and the size (a) of said outer side (10) increases approximately from the upper section (A:A) to the central section (C:C) of the diagonal tube (1).

Abstract: A rear bicycle frame structure which has different rear triangles that make up a common tubular structure that forms part of the front frame, an upper tie bolt and a lower tie bolt. The upper tie bolt and the lower tie bolt are joined by a fourth side forming four-sided piece. A rear axle is placed on the fourth side of each four-sided piece formed.

Abstract: Rear bicycle frame structure of the kind comprised of different rear triangles that make up a common tubular structure (C) that forms part of the front frame, an upper tie bolt (ts) and a lower tie bolt (ti); characterised because the upper tie bolt (ts) and the lower tie bolt (ti) are joined by means of a fourth side (t4) forming a four-sided piece. The rear axle (P2) is placed on the fourth side (t4) of each rear four-sided piece formed.