Abstract: Bicycle frame, which consists of a rear triangle (t) joined to a front quadrilateral (c) of tubular elements, with a common coupling element (A) for the two, which is joined at the upper part with an upper tube (4) and the rear triangle (t) consisting of upper braces (3), lower braces (7) and the sealing element (2), which is curved and covers the back wheel of the bicycle, and the shaft (e2) of the coupling element(A) being approximately coplanar with the shaft of the upper braces (3) forming a comfort angle (?) with respect to the shaft of the upper tube (4) of equal value to or greater than 120°: ?>120°.

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.

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: The invention relates to a bicycle frame consisting of a rear triangle (t) which is joined to a front quadrilateral structure (c) of tubular elements, comprising a coupling element (A) which is common to both. The top of the coupling element is joined to an upper tube (4). In addition, the rear triangle (t) is equipped with upper tie-rods (3), lower tie-rods (7) and a curved closure element (2) which covers the rear wheel of the bicycle. The axis (e2) of the aforementioned coupling element (A) is approximately coplanar with the axis of the upper tie-rods (3), forming a comfortable angle (a) in relation to the axis of the upper tube (4) that is equal to or greater than 120°: a>120°.