Crank arm spider improvement for attaching ovoid chainrings

Abstract

Crank arm spider adjustment orientation system to provide different angular orientations in the attachment of at least an ovoid chainring, comprising an ovoid chainring () and a spider (), both of them provided with multiple anchorage points () arranged as holes distributed along the perimeter of a BCD, and mechanical anchorage means () engaging chainring anchorage points () with corresponding spider anchorage points (); where the number of said spider anchorage points () is multiple of and greater than the number of said mechanical anchorage means (), and the angular increment between consecutive chainring's () orientations provided by the chainring anchorage points () is different than the angular increment between consecutive chainring's () orientations provided by the spider anchorage points (), so the combination of the spider () with at least one ovoid chainring () multiplies the possibilities for said ovoid chainring's () orientation reducing the angular increment between consecutive chainring's () orientations.