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Wartung von Sturmey-Archer Acht-Gang-Naben (Quelltext anzeigen)
Version vom 20. Juli 2016, 06:04 Uhr
, 20. Juli 2016Überschriften übersetzt und etwas umformatiert
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(Überschriften übersetzt und etwas umformatiert) |
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The 8-speed Sturmey-Archer hubs have an innovative, modular design with 3 planetary systems one after the other. If a module's sun gear is locked to the axle, it has an increase ratio, and if not, a unity ratio. Each of the three modules has a different increase ratio. The eight possible combinations offer eight different speeds. | |||
Because these hubs only gear up, they require a much smaller chainwheel than other hubs and are especially well-suited to a small-wheel bicycle. These hubs are most efficient in the lowest gear, which passes power directly from the driver to the hub shell, and least efficient in the highest gear, which uses all three modules. | Because these hubs only gear up, they require a much smaller chainwheel than other hubs and are especially well-suited to a small-wheel bicycle. These hubs are most efficient in the lowest gear, which passes power directly from the driver to the hub shell, and least efficient in the highest gear, which uses all three modules. | ||
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There is more detailed information on sprockets and on setting the gear range on another page. Also see Sheldon's take on setting the gear range for this hub, on his 8-speed Raleigh Twenty page. Different (pedal) strokes for different folks... | There is more detailed information on sprockets and on setting the gear range on another page. Also see Sheldon's take on setting the gear range for this hub, on his 8-speed Raleigh Twenty page. Different (pedal) strokes for different folks... | ||
==Technik== | |||
A few technical issues are important when specifying, installing or rebuilding these hubs: | A few technical issues are important when specifying, installing or rebuilding these hubs: | ||
* The right-side ball ring unscrews counterclockwise from the hub shell, according to the most reliable . information we have. Sturmey-Archer has published information indicating both directions! This ball ring does not include a ratchet, unlike those of most Sturmey-Archer internal-gear hubs. | |||
* Reliability has been an issue with these hubs, though it appears to be improving with newer production. | |||
* These hubs are grease-lubricated and have no port through which oil can be introduced. Oil can be added after unscrewing the left ball cup. These hubs should be disassembled and relubricated periodically. Disassembly is fairly easy with the newer models. It may be advisable to relubricate before installing a new hub: see advice here. | |||
* Stout antirotation washers should be used, preferably both inside and outside the dropouts. See advice here. Also, gear down and spin rather than pushing hard in a high gear. As the lowest gear ratio is unity, torque on the axle decreases, the lower the gear. | |||
* The sprocket is unlike the one used on most other internal-gear hubs. The center hole is much larger, and the sprocket is available only with 20, 23 or 25 teeth. The sprocket has three lugs and is held in place by a circlip (snap ring). The 20 and 23-tooth versions are flat; the 25-tooth version is also available dished. | |||
* The brakeless version is especially well-suited to older bicycles with narrow rear dropout spacing. By the choice of locknuts and by using the brakeless version of the hub, the overlocknut distance can be smaller than for any other internal-gear hub with 7 or more speeds -- as little as 115 mm. | |||
* If you're going to use rim brakes and a 130mm or 135mm overlocknut distance, get the "K", disc brake version rather than the "F" freewheel version. The "K" has a natively wider hub shell and better bearing placement. (Thanks to Prester John on the Geared Hub Bikes e-mail list for this advice.) But this version may also require a larger chainline. | |||
* Sturmey-Archer sells cranksets adapted to this hub, with tooth counts in the 30s, and designed to work with a full chain case. | |||
* These hubs shift with a pulley mechanism concentric with the axle inboard of the frame, and use different shifters from other Sturmey-Archer hubs. The newer (W) versions cleverly allow the pulley mechanism to be installed at different angles, so that only one type or antirotation washers is necessary, regardless of the angle of the dropout slots. | |||
== Technische Informationen zu Modellen ab 2009 == | |||
The 2009- models are very similar to the first series, but a different tool is used to remove the screw-in right ball cup, and obviously, many of the internal parts are different. A part number ending in (W) is sometimes used to distinguish the 2009- hubs from the earlier models, but not consistently, possibly leading to confusion. The ball ring of the newer-series hubs has six notches for the ball-ring removal tool, the older series, two notches. Parts in parts lists for hubs made since 2009, with or without the (W), are compatible. You may compare the two parts lists for the XRD8(W) linked below to confirm this. | The 2009- models are very similar to the first series, but a different tool is used to remove the screw-in right ball cup, and obviously, many of the internal parts are different. A part number ending in (W) is sometimes used to distinguish the 2009- hubs from the earlier models, but not consistently, possibly leading to confusion. The ball ring of the newer-series hubs has six notches for the ball-ring removal tool, the older series, two notches. Parts in parts lists for hubs made since 2009, with or without the (W), are compatible. You may compare the two parts lists for the XRD8(W) linked below to confirm this. | ||
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X-RK8 (W) Disk brake fitting Parts list | X-RK8 (W) Disk brake fitting Parts list | ||
Installation instructions. | Installation instructions. | ||
== Technische Informationen zu Modellen ca. 2004 bis 2009 (eingestellt) == | |||
Technical documentation is available for some of these models. | Technical documentation is available for some of these models. | ||
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X-RR8 Roller brake Like X-RF8 | X-RR8 Roller brake Like X-RF8 | ||
== Siehe auch == | |||
Another article on this site covers topics common to many Sturmey-Archer hubs. Please read that article to learn about | |||
* Date and model identification | |||
* Cable replacement | |||
* Cable adjustment | |||
* Cone Adjustment | |||
* Anti-rotation washers | |||
* Axle length | |||
* Lubrication | |||
There are also articles on this site more generally about | |||
* Internal-gear hubs | |||
* Cribsheet -- Sturmey-Archer hubs since the 1930s | |||
* Disassembly of Sturmey-Archer hubs | |||
* Special alignment and adjustment (Dynohubs, hub brakes, shifter parts) | |||
* Use and maintenance of Sturmey-Archer hubs | |||
* Parts and names (older Sturmey-Archer hubs) | |||
* Sturmey-Archer corporate history and hub models | |||
Sturmey-Archer Informationen | |||
* Official Site | |||
Sturmey-Archer | * old Sturmey-Archer logo Heritage site | ||
Official Site | * Three-Speed Parts from Harris Cyclery | ||
old Sturmey-Archer logo Heritage site | * English Three Speeds, Care and Feeding | ||
Three-Speed Parts from Harris Cyclery | * Internal-Gear Hubs | ||
English Three Speeds, Care and Feeding | * Sturmey-Archer Hubs, General Information | ||
Internal-Gear Hubs | * Sturmey-Archer 1902-1952 | ||
Sturmey-Archer Hubs, General Information | * Sturmey-Archer 1935-38 Catalogues | ||
Sturmey-Archer 1902-1952 | * Evolution of the Raleigh Sports | ||
Sturmey-Archer 1935-38 Catalogues | * Sheldon's 8-speed Raleigh Twenty | ||
Evolution of the Raleigh Sports | * John Allen's spreadsheets of internal-hub gear ratios | ||
* Martin Hanczyc's roadster pages. | |||
Sheldon's 8-speed Raleigh Twenty | * Tony Hadland's Sturmey-Archer Pages including the 1956 master catalogue with rebuilding information for SWs and others. | ||
John Allen's spreadsheets of internal-hub gear ratios | * Hubstripping web site | ||
Martin Hanczyc's roadster pages. | * Retro Raleighs | ||
Tony Hadland's Sturmey-Archer Pages | * SW Hubs by Brian Hayes | ||
including the 1956 master catalogue with | * Jane Thomas's site with Sturmey-Archer service manuals. | ||
rebuilding information for SWs and others. | * Menotomy Vintage Bicycles | ||
Hubstripping web site | * Chat forum on English bikes. | ||
Retro Raleighs | |||
SW Hubs by Brian Hayes | |||
Jane Thomas's site with | |||
Sturmey-Archer service manuals. | |||
Menotomy Vintage Bicycles | |||
Chat forum on English bikes. | |||
==Quelle== | ==Quelle== | ||
