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Sheldon Browns Fahrrad mit 63 Gängen: Unterschied zwischen den Versionen

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==63 Gänge==
===63 Gänge===


The O.T.B. currently sports a Sturmey-Archer AW 3-speed hub, with 7 sprockets, driven by 3 chainwheels: 3 x 7 x 3 = 63. When people hear that I have built a 63-speed bicycle, the first question they ask is "do you really need all those gears?"
Zuletzt wurde das OTP mit einer Sturmey-Archer AW Drei-Gang-Nabe und sieben Ritzeln, die mit einer [[Dreifachkurbel]] angetrieben waren: 3 x 7 x 3 = 63 Gänge! Wenn  Leute hörten, dass Sheldon Brown ein 63-Gänge Fahrrad gebaut hatte, war zumeist die erste Frage, ob man all diese Gänge wirklich benötigt.


The answer, of course, is "no.", but I don't actually need all the gears on a ten speed either. In fact, most of my riding is done on one-speed (fixed-gear) bikes. Nobody needs 63 gears, but it was an interesting and amusing mechanical challenge to put it together, and it does give a very wide range, with close spacing between ratios. There are probably gears that this bike has never actually been ridden in!
Die Antwort lautet selbstverständlich "Nein!". Tatsächlich benötigt man selbst bei einer Zehnfach-Schaltung nicht alle Gänge. Faktisch hat Sheldon Brown die meisten seiner Fahrradfahrten mit einem [[Eingangfahrrad]] (Fixed-Gear) erledigt. Niemand braucht wirklich 63 Gänge, aber es war eine amüsante technische Herausforderung, das Ganze zusammenzustecken. Zudem gibt es eine sehr hohe Bandbreite an Gängen mit sehr kleinen Abstufungen zwischen ihnen. Es gab sicherlich eine Menge Gänge, in denen das Fahrrad tatsächlich nie gefahren wurde.
 
Tatsächlich war Sheldon Brown seiner Zeit vermutlich einige Jahre voraus, weil ein paar Jahre später [[Sachs]] eine Drei-Gang-Nabe auf den Markt brachte, die man mit einer Siebenfach-[[Kassette]] bestücken konnte. Nichtsdestotrotz war Sheldon Brown vermutlich der erste, der es geschafft hatte sieben Ritzel auf einer Sturmey-Archer Nabe funktionierend zu montieren.


Actually, I guess I was just ahead of my time, because a similar setup is now offered by Sachs, a 3-speed hub which is designed to take a 7-sprocket cassette. Nevertheless, as far as I know, I am the first to succeed in getting 7-sprockets to work on a Sturmey-Archer hub!


The toughest challenge of this was getting enough axle length. I used the longest Sturmey-Archer axle available, but even that was far too short for a normal installation on the right side. I used a conical countersink drill bit to countersink a hole into the adaptor claw, then I bevelled the edges of the special axle nut so that they would fit into the countersink. This only gives 5 or 6 threads of engagement, but since the countersinking prevents the axle from being able to slide forward, that is enough. Axles on internal-gear hubs have a tendency to rotate if not secured solidly, so I took extra pains on the left side to use the appropriate anti-rotation washer, and two nuts, both tightened quite snugly.
The toughest challenge of this was getting enough axle length. I used the longest Sturmey-Archer axle available, but even that was far too short for a normal installation on the right side. I used a conical countersink drill bit to countersink a hole into the adaptor claw, then I bevelled the edges of the special axle nut so that they would fit into the countersink. This only gives 5 or 6 threads of engagement, but since the countersinking prevents the axle from being able to slide forward, that is enough. Axles on internal-gear hubs have a tendency to rotate if not secured solidly, so I took extra pains on the left side to use the appropriate anti-rotation washer, and two nuts, both tightened quite snugly.
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