Chamfered sprocket assembly

A sprocket for engagement with a chain, the sprocket comprising:

• a sprocket body having a center, a first side, a second side and a rim on the outside periphery thereof;
• a plurality of toothlike projections arranged on the rim of the sprocket body to engage the chain;
• and
• wherein the first side and second side of the sprocket body each include a chamfer portion between the toothlike projections, the chamfer portion extending from the rim in a direction toward the center of the sprocket body,
• wherein the chamfer portions on the second side of the sprocket body are smaller than the chamfer portions on the first side of the sprocket body.

A chainwheel assembly comprising:

• a large sprocket having a sprocket body with a center, a first side, and a rim on the outside periphery thereof, a plurality of toothlike projections arranged on the rim of the sprocket body to engage the chain, wherein the first side of the sprocket body includes a chamfer portion between the toothlike projections, the chamfer portion extending from the rim in a direction toward the center of the sprocket body;
• and
• a smaller sprocket having a first side and a second side, wherein the second side of the smaller sprocket faces the first side of the larger sprocket and the first side of the smaller sprocket faces away from the first side of the larger sprocket,
• wherein each of the chamfer portion of the larger sprocket and the smaller sprocket includes a crest offset from a center of the chamfer portion, a first edge and a second edge, and wherein each of the chamfer portions tapers from the crest to the first edge and the second edge, respectively;
• and
• wherein each of the larger and the smaller sprockets has a driving direction and the crest of the chamfer portion of each of the sprockets is offset towards the driving direction.

A sprocket for engagement with a chain, the sprocket comprising:

• a sprocket body having a center, a first side, and a rim on the outside periphery thereof;
• a plurality of toothlike projections arranged on the rim of the sprocket body to engage the chain;
• a plurality of chamfered portions, each chamfered portion located between one of the toothlike projections and an adjacent toothlike projection;
• a disengagement-facilitating portion of the sprocket including at least one of the plurality of toothlike projections and at least one of the chamfered portions;
• wherein the chamfered portions outside of the disengagement-facilitating portion are smaller than the chamfered portions within the disengagement-facilitating portion.