Toothed chain for a bicycle

A chainring adapted to drive a chain for a bicycle comprising a plurality of interleaved link elements, wherein each link element of the plurality of link elements is pivotably attached to at least one other link element of the plurality of link elements and comprises:

• two plate members, the plate members being in contact at a first end of the link element and being spaced from one another at a second end of the link element;
• at least two teeth including a first tooth located at a first end and the second tooth located at the second end of the link element, wherein a flank of each tooth is adapted to engage with flanks of sprocket teeth and sustain a driving force applied therebetween, and wherein the first tooth is laterally offset from the second tooth such that a first plane in which the first tooth is adapted to engage with a sprocket tooth is parallel to and offset from a second plane in which the second tooth is adapted to engage with an adjacent sprocket tooth;
• and
• a recess provided between the two plate members and in a first side between the first end and the second end, the recess being configured to receive a sprocket tooth therein to substantially maintain a lateral arrangement of the chain and enable the sprocket tooth to engage with a flank of a first tooth located at a respective first end of an adjacent link element in the first plane, and
• the chainring comprises:
• a plurality of sprocket drive teeth, wherein each of the plurality of sprocket drive teeth have a driving flank with a profile corresponding to the profile of at least one of the teeth of each of the plurality of link elements;
• and
• a plurality of guide teeth, wherein each guide tooth is configured to be received in the recess of a link element of the plurality of link elements and substantially maintain a lateral arrangement of the chain to enable the sprocket drive teeth to engage with and drive the second tooth of the link element.

A sprocket cassette for being driven by a chain for a bicycle comprising a plurality of interleaved link elements, wherein each link element of the plurality of link elements is pivotably attached to at least one other link element of the plurality of link elements and comprises:

• two plate members, the plate members being in contact at a first end of the link element and being spaced from one another at a second end of the link element;
• at least two teeth including a first tooth located at a first end and the second tooth located at the second end of the link element, wherein a flank of each tooth is adapted to engage with flanks of sprocket teeth and sustain a driving force applied therebetween, and wherein the first tooth is laterally offset from the second tooth such that a first plane in which the first tooth is adapted to engage with a sprocket tooth is parallel to and offset from a second plane in which the second tooth is adapted to engage with an adjacent sprocket tooth;
• and
• a recess provided between the two plate members and in a first side between the first end and the second end, the recess being configured to receive a sprocket tooth therein to substantially maintain a lateral arrangement of the chain and enable the sprocket tooth to engage with a flank of a first tooth located at a respective first end of an adjacent link element in the first plane, and
• the sprocket cassette comprises:
• one or more sprockets, each sprocket comprising a plurality of sprocket teeth, wherein each of the plurality of sprocket teeth have a flank with a profile corresponding to the profile of at least part of the respective first tooth of each of the plurality of link elements, and having a width that is less than a width of the recess in the first side of a link element.