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<center>''Ritzel mit drei Nuten, das von einem Federring gehalten wird''</center>
<center>''Ritzel mit drei Nuten, das von einem Federring gehalten wird''</center>


Except with a fixed-gear or coaster-brake hub, it is possible to double the useful life of a 3-lug sprocket by flipping it over so the wear is on the other side of the teeth -- as long as you can achieve a good chainline.
Ausgenommen bei Fixed-Gear- und Rücktrittbremsennaben kann man die Lebensspanne eines Drei-Nute-Ritzels verdoppeln, indem man es umdreht, so dass der [[Verschleiß]] auf der anderen Seite der Zähne liegt. Das funktioniert natürlich nur, wenn man weiterhin eine gute Kettenlinie hat.
 
Nachdem man das Ritzel wieder montiert hat, ist es eine gute Idee, den Sitz des Federings zu perfektionieren, indem man mit einem Hammer und einem Locheisen rundherum diesen festklopft. Das ist insbesondere wichtig, wenn man eine Rücktrittbremse hat, weil diese versagt, wenn das Ritze herunter rutschen sollte.
 


After re-installing the sprocket, it is a good idea to seat the circlip by going around it and tapping it lightly with a hammer and punch. This is especially important on a hub with a coaster brake, because the brake will fail if the sprocket slips off.


It is also fairly easy to modify any Shimano cassette sprocket that doesn't have a built-in spacer. These are available from 14-34 teeth. Shimano cassette sprockets have the same internal diameter as those used with internal gear hubs, but have 9 splines instead of 3. With a suitable grinder, 6 of the splines need to be removed, and the corners of the remaining three rounded off. A thin spacer washer may also be needed, because the cassette sprockets are a bit thinner than the stock sprockets. On a Sturmey-Archer (N) hub, you may use an unmodified Shimano Freehub sprocket, but you may still need the spacer washer.
It is also fairly easy to modify any Shimano cassette sprocket that doesn't have a built-in spacer. These are available from 14-34 teeth. Shimano cassette sprockets have the same internal diameter as those used with internal gear hubs, but have 9 splines instead of 3. With a suitable grinder, 6 of the splines need to be removed, and the corners of the remaining three rounded off. A thin spacer washer may also be needed, because the cassette sprockets are a bit thinner than the stock sprockets. On a Sturmey-Archer (N) hub, you may use an unmodified Shimano Freehub sprocket, but you may still need the spacer washer.
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