Patent ID: 8491428
Filing Date: 2013-07-23
Classification: B62M

Abstract:
1. A bicycle structure comprising: a crankset including a plurality of chain rings, with a largest chain ring of the plurality of chain rings having a plurality of teeth with teeth bottoms interposed between adjacent ones of the teeth; and a front derailleur including a chain guide having a chain guide slot partially defined by a first chain engagement surface with a protruding part that protrudes outwardly from the first chain engagement surface into the chain guide slot, the protruding part being located away from the teeth bottoms of the largest chain ring in a radial outside direction of the largest chain ring by a prescribed distance in a range from eight millimeters to sixteen millimeters, the protruding part having a radially innermost edge disposed radially outward of a rotational path of a radially outermost surface of the largest chain ring.