Patent ID: 7749117

Claim:
A chainring suitable for road bicycles, which can be fastened to generic bicycle drive-side cranks which have a plurality of extensions as the chainrings' anchorage system, comprising: an oval form defined by a major and a minor main primitive diameter, having an elongation of 1.10; a profile for the oval form inscribed in an ellipse with same major and minor diameters, having a relative perimeter, defined by the primitive perimeter divided by the perimeter of the ellipse of 0.993; provided with a plurality of anchorage holes in number which is a multiple of said plurality of extensions; permitting multiple anchorage options to the corresponding drive-side crank; having a single anchorage option marked as preferred, by which the chainring is fastened to the corresponding drive-side crank having an orientation, defined by the angle in pedaling direction between the major primitive diameter of the ovoid and the centerline of the fastened crank, of 108°; and the other anchorage options having orientations of around 108°, wherein each of the multiple options is specifically marked as having a greater or smaller orientation value, resulting in an indicated setting scale.