Shimano Nexus Sieben-Gang-Naben
Dieser Artikel bezieht sich ausschließlich auf Shimano Nexus Sieben-Gang-Nabenschaltungen. Es gibt einen allgmeineren Artikel auf dieser Seite, der sich generell über Technische Informationen zu Nexus und Alfine Drei-, Vier-, Sieben-, Acht- und Elfgangnaben auslässt. Insbesondere werden folgende Themenbereiche abgedeckt:
- Sicherungsscheiben
- Bremsentypen
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- Einstellarbeiten
- Allgemeine Hinweise
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- Schmierung
- Ritzel
- Aufrüsten von Fahrrädern
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Weiterhin gibt es auf diesen Seiten noch allgemeinere Artikel zu folgenden Themen:
Es ist sicherlich sinnvoll, sich auch mit diesen Artikeln begleitend zu diesem zu beschäftigen. Für detaillierte Hinweise zu Montage von Ritzeln und dem Finden der richtigen Übersetzungsbreite kann man sich im Abschnitt Ritzel und Kettenblätter auswählen im allgemeinen Artikel zu Nabenschaltungen informieren.
Übersetzungssbandbreite
Nexus is a family of parts, of which the Nexus Inter 7 seven speed hub is one. The overall range of the Nexus 7-speed is 245%:
Ratio 0.632 0.741 0.843 0.989 1.145 1.335 1.545 Step 17.3% 13.8% 17.3% 15.8% 16.6% 15.8%
For comparison, your old 3-speed had a range of 178%:
Ratio 0.750 1.000 1.333 Step 33.3% 33.3%
Click here for an On-line Gear Calculator for Internally-Geared Hubs
Funktionsweise
Wouter Pasman has posted an article in PDF format on the Web describing the workings of the Nexus 7-speed. It's a bit technical but if that's what you want, there you go. Thanks, Wouter!
Montage und Reparaturanleitungen
The table below lists models of first, coaster brake, then freewheel/Rollerbrake Shimano 7-speed hubs from newest to oldest. The table links to current Shimano documents, but also to documents generated outside Shimano, or which Shimano no longer offers.
General information on installation and adjustment of newer Shimano Nexus 7-speed hubs is in the Dealer's Manual.
Shimano 7-speed hubs have a overlocknut spacing from 127 to 130 mm, as sold; -- see Shimano's overlocknut spacing chart. Overlocknut spacing can be reduced somewhat by using a different locknut and omitting the Rollerbrake, as described on the Rollerbrake page.
The 7-speed hubs have gone through several minor design changes, resulting in new model numbers and parts incompatibilities. Rebuilding instructions from Shimano in English are available only for one coaster-brake model and one freewheeling model, though others are similar.
Did you go too far when tearing down a hub? This site also includes information from reader Keith Lang on how to rebuild the axle unit of the 7-speed hub. Wouter Pasman's disassembly/reassembly instructions also include this information.
Replacement parts availability is a concern, and so you may have to substitute an internal assembly from a different model. The internal mechanism of these hubs is complicated, and the usual repair is to replace it in its entirety. It can usually be replaced with a newer version as long as the hub is of the same basic type (with or without coaster brake).
The right-hand hub bearing cup is vulnerable to damage from water contamination. Better lubrication is recommended to forestall this problem and to make cleaning and rebuilding easier.
Most parts lists include some compatibility information, and many are formatted similarly so that you can compare them visually (like an astronomer looking at two sky photos in a "blink comparison" when searching for an exploding star or an asteroid).
The Shimano Inter-7 hub Dealer's Manual/User Manual page makes many of the documents listed below available in other languages besides English, in case that is your preference.
Model Features Documentation Nexus SG-C3001-7C Coaster brake Find documentation with this search Nexus SG-C3001-7C-DX Coaster brake Find documentation with this search Nexus SG-C3000-7C-DX Coaster brake Find documentation with this search Nexus SG-C3000-7C Coaster brake Find documentation with this search Nexus SG-7C30 Coaster brake Find documentation with this search Installation instructions, older document Nexus SG-7C26 Coaster brake Find documentation with this search (Parts list, exploded drawing on alternate site) Installation instructions Rebuilding instructions Nexus SG-7C25 Coaster brake Parts list, exploded drawing Nexus SG-7C22 Coaster brake Parts list, exploded drawing Axle assembly rebuilding instructions (in German) Nexus SG-7C21 Coaster brake Parts list, exploded drawing Axle assembly rebuilding instructions (in German) Functional description (see p. 3) and power transmission (see p. 23) in German Nexus SG-7C20 Coaster Brake Parts list, exploded drawing Functional description (see p. 3 and power transmission (see p. 23) in German Nexus SG-7C18 Coaster brake Find documentation with this search Parts list, expoded drawing on alternate site Installation instructions Installation instructions on alternate site Nexus SG-7C16 Coaster brake Parts list, exploded drawing (same, on alternate site) Installation instructions (same, on alternate site) Nexus SG-7C15 Coaster brake Parts list, exploded drawing Nexus SG-C3001-7D Disc brake Find documentation with this search Nexus SG-C3001-7R Rollerbrake/brakeless Find documentation with this search Nexus SG-C3000-7R Rollerbrake/brakeless Find documentation with this search Nexus SG-7R50 Rollerbrake/brakeless Find documentation with this search Installation instructions Nexus SG-7R46 Rollerbrake/brakeless Find documentation with this search Wouter Pasman's rebuilding instructions Rebuilding instructions, Shimano site Nexus SG-7R45 Rollerbrake/brakeless Find documentation with this search Wouter Pasman's rebuilding instructions Nexus SG-7R42 Rollerbrake/brakeless Parts list, exploded drawing Parts list, exploded drawing (may be older) Nexus SG-7R41 Rollerbrake/brakeless Parts list, exploded drawing Manual, in German with rebuilding instructions Same, another source Nexus SG-7R40 Rollerbrake/brakeless Parts list, exploded drawing Manual, in German with rebuilding instructions Same, another source
Ein bestehendes Fahrrad umrüsten
In some cases, it is possible to convert an existing bicycle to use a Nexus hub. I have a very nice 1970's Raleigh Competition racing frame which I have converted into a Nexus 7-speed. Sheldon Brown's Nexus Raleigh Competition
Sheldon Brown's Nexus Raleigh Competition
Mein erstes Nexus Sieben-Gang Fahrrad
I purchased a Shimano SG-7R40 hub, and installed it on one of my own bicycles, an early '70's Peugeot PX-10 racing bike. My initial impression on actually using one was extremely favorable. I particularly like the RapidFire control unit, which is very easy to use and has a very light touch. I also am pleased at how well-protected the linkage to the hub is. This hub uses a rotating ring operated by the cable, inboard of the chainstay. There are no delicate parts protruding out past the frame, as with other internal-gear hubs. I find the range of gears quite pleasant to use, and the efficiency of the hub doesn't appear to be any worse than the Sturmey-Archer FM four-speed unit it replaced.
My Peugeot "PX-7" has time-trial style "cowhorn" bars, which are a lot like the bottom part of drop bars. The usual orientation for the RapidFire shifter is on the right, hanging below straight bars, where it may easily be operated by the right thumb. The cable runs inward parallel to the bar.
On my Peugeot, I have it on the left side, clamped to the bar just below the brake lever, where it it very convenient to be operated by my left thumb. The cable runs downward, making a neat run toward the down tube of the frame. This works quite well for me. I have a separate page about this bike, with pictures.
Siehe auch
- Shimano current 7-speed Hub Page
- Shimano Tech Tips -- structure and function, troubleshooting charts etc.
- Shimano Nexus lubricants.
- Long article on CTC (UK) Web site about workings of the Nexus 7-speed hub
- Wouter Pasman's technical description of the workings of the Nexus 7-speed hub
Quelle
Dieser Artikel basiert auf dem Artikel The Shimano Nexus 7-Speed Hub von der Website Sheldon Browns. Originalautor des Artikels ist Sheldon Brown. Ergänzungen stammen von John Allen.
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