Shimano Nexus und Alfine Acht-Gang-Naben: Unterschied zwischen den Versionen

Nexus is a family of parts, of which the Nexus Inter 8 eight speed hub is one. The Alfine 8-speed hub is a very similar, higher-end model which has a disc-brake fitting.

The overall range of the Shimano 8-speed hubs is 307%, and the steps in gears are a bit uneven:

Click here for an On-line Gear Calculator for Internally-Geared Hubs

The Nexus and Alfine 8-speeds are more rugged than at least the older 7-speeds, but it have some well-known failure modes, and there are also well-known ways to prevent failure.

Probably the most common failure, though, is due to insufficient lubrication, leading to contamination by water and dirt.

(Links to instructions may be found at the end of this section)

Shimano has information on most but not all 8-speed models. These hubs have gone through several minor design changes, resulting in new model numbers and parts incompatibilities. Hubs parts numbers start with SG but there are also other parts listed, including brakes and shift levers. globeThese pages are available in multiple languages, with a language list box at the upper right corner of the screen.

Several Shimano dealer's manuals offer information on installation, adjustment and maintenance of newer hubs:

Model numbers are of the form

Shimano made information sheets available individually for earlier hubs. The tables below list hubs in each series individually in order from newest to oldest, describing their differences, linking to information from various sources. The right-hand column holds links to available information. Dealer's manuals with information commont to many hubs areomitted. Shimano has provided rebuilding instructions for only one model, though others are similar.

There is some interchangeability between Alfine and Nexus models. When a model number in the interchangeability column is in italics, the entire internal assembly is compatible.

Model Features Documentation MU/Cassette Joint Interchangeability

SG-S7051-8 Electrical (Di2) shifting. Mostly compatible with SG-7001-8 but axle assembly and right-hand cone assembly are different.

CJ-8S20 WH-S500-V-8D (A type), SG-8R35

Model Features Documentation MU/Cassette Joint Interchangeability

SG-C6061-8R, SG-6061-8V Electrical shifting, three roller clutches, Rollerbrake Parts list, exploded drawing, manuals

Installation instructions CJ-8S20 None listed but similar to SG-8R22

Model Features Documentation MU/Cassette Joint Interchangeability

SG-C6061-8CD Electrical shifting, one external roller clutch, coaster brake and disc brake rotor! Parts list, exploded drawings, manuals MU-S705 None listed but probably compatible with SG-C6060-8CD

Nexus SG-8C20 One external roller clutch, coaster brake Parts list, exploded drawing CJ-8S20 None listed but probably compatible with SG-8C22

In some cases, it is possible to convert an existing bicycle to the use of a Nexus hub.

If you leave off the Rollerbrake ®, you can get the spacing down to about 126 mm, as already mentioned. This is what I did on my Nexus bike. The Rollerbrake ® is a separate module, and when you buy the hub it is not even installed. (The brake unit would get in the way of fitting the spokes through the hub flange, so it has to be installed after the wheel has been built.)

Shimano technical information pages

Shimano Tech Tips -- older pages: structure and function, troubleshooting charts etc.