==Die Kette einstellen==
===1/8 Zoll oder 3/32 Zoll Ketten?===
Many bicycles with a non-derailer drivetrain use a wider chain than is common on multi-speed bicycles. Derailer-type chain (up through 9-speed) has a nominal internal width of 3/32". Non-derailer bicycles, including most track bicycles, use the wider 1/ 8" size. You can buy sprockets in either width.
(Some people mistakenly refer to the width as "pitch", speaking of "road pitch" or "track pitch". This is a malapropism. The pitch is the distance between the rollers, and all modern bicycle chain has the same pitch, 1/ 2"/ 12. 7 mm. )
The 1/ 8" size is slightly heavier, but doesn't seem to perform any better in our experience. Your choice may be dictated by the width of the rear sprocket, and a 1/ 8" rear sprocket will usually wear longer. A master link for 1/8" chain can be removed and replaced without loosening the rear wheel, making it easier to remove the chain for cleaning; not so with a master link for derailer chain.
For the true retro fixed-gear fan, another option is 1" x 3/16" chain. This used to be common on track bikes. This requires special sprockets with only half as many teeth as standard 1/2" pitch sprockets. Serious old-time trackies used "block" chain, which had no rollers. This is no longer available. Roller chain is still sometimes findable in this size.
Even more obscure is the 10mm pitch chain promoted by Shimano in the early 1980s. The idea was to save weight by making everything littler. An idea whose time never came.