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Shimano Alfine
Alfine is the name of a comfort and urban oriented product series by Shimano. It is mainly known for internally geared hubs, but includes also hydraulic disc brakes and levers, chain tensioners, dynamo hubs, cranksets, shift levers, and complete wheels.〔(Shimano Technical Documentation )〕
==Alfine 500==
The Alfine 500 group, first introduced at Eurobike in 2006,〔(Shimano Alfine ), ''Bicycle Designs'', published September 5, 2006〕 included the epicyclic hub gear SG-S500. The internal mechanical design of the gear hub was based on that of the Shimano Nexus Inter 8, with two stepped planetary series, 5th gear being 1:1 direct drive,〔(), ''Shimano, route of power transmission for 8 speed hubs''〕 thus offering 8 speeds with percent intervals of 22,16,14,18,22,16,14, and an overall gear range of 307%, yet in a more attractive design than the Nexus, with better seals allowing slightly greater ruggedness, more attractive auxiliary components such as e.g. a ratcheting trigger shifter similar to the high-end Shimano derailleur shifters, and a hub shell with splines for mounting a disc brake rotor of the center lock standard. These mechanisms are grease-lubricated.
For 2013 a new 505 model is being offered with Di2 electronic shifting.〔(), ''Shimano SG-S505 Alfine Di2 internal hub gear, 8-speed''〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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