About: http://webisa.webdatacommons.org/428633444

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	So if I understand this correctly, there is a gear at which point the mechanism automatically switches not just between the internal rear cogs, but also from one internal chainring to another.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.co.uk