Patent ID: 11919606
Assignee: SRAM DEUTSCHLAND GMBH
Field: Transport (Mechanical engineering)
Classification: CPC B  F | IPC B

Claim 15:
16. The bicycle rear-wheel sprocket cassette according to claim 15, wherein the 21-T sprocket in the end side thereof that faces the 18-T sprocket, along a portion of the circumference of the 21-T sprocket has at least two upshift regions having in each case one upshift recess formation, wherein each upshift region, when axially viewing the transition sprocket group in a relative state in which the 18-T sprocket lies closer to the observer than the 21-T sprocket, is configured and disposed so as to permit on the transition sprocket group rotating in the clockwise direction about the sprocket axis a change of engagement of the bicycle roller chain from the 21-T sprocket to the 18-T sprocket, wherein on the 21-T sprocket each of the two upshift recess formations is in each case assigned only exactly one release tooth which by way of the design and orientation thereof, when interacting with the upshift recess formation assigned thereto during an upshift procedure from the 21-T sprocket to the 18-T sprocket, is configured to be the last tooth that engages between a link plate of a chain link of the bicycle roller chain wherein an even number of teeth lie between the release teeth of upshift recess formations that are adjacent in the circumferential direction, wherein the release teeth of the adjacent upshift recess formations are not to be included in the count; or/and the 21-T sprocket in the end side thereof that faces the 18-T sprocket, along the circumference of the 21-T sprocket has at least two downshift regions having in each case one downshift recess formation, wherein each downshift region, when axially viewing the transition sprocket group in the relative state, is configured so as to permit on the transition sprocket group rotating in the clockwise direction about the sprocket axis a change of engagement of the bicycle roller chain from the 18-T sprocket to the 21-T sprocket, wherein on the 21-T sprocket each downshift recess formation is in each case assigned exactly only one catch tooth which by way of the design and orientation thereof, when interacting with the downshift recess formation assigned thereto during a downshift procedure from the 18-T sprocket to the 21-T sprocket is configured to be the first tooth that engages between link plates of a chain link of the bicycle roller chain, wherein an even number of teeth lie between the catch teeth of downshift recess formations that are adjacent in the circumferential direction, wherein the catch teeth of the adjacent downshift recess formations are not to be included in the count.