Umbauten auf den starren Gang: Unterschied zwischen den Versionen

One-speed bikes are very easy to convert, since they usually already have 110 mm spacing. Unfortunately, most adult-sized one-speed bikes are not very good performers, and tend to be too heavy and sluggish for enjoyable fixed-gear riding. Some of the better-quality cruisers work OK as fixed gears, but watch out for low bottom brackets.

Der weiter oben erwähnte Bruce Ingle hat Sheldon sogar noch übertroffen mit seinem Drei-Gang-Fixed-Gear Mountainbike. Er immobolisierte den Rastklinkenmechanismus einer [[Shmano]] Kassetennabe durch zusammenlöten. Sheldon war etwas unsicher wegen der Dauerhaltbarkeit dieser Lösung - insbesondere mit Blick auf die Verbindung zwischen Freilauf- und Nabenkörper. Er wollte das noch zu Lebzeiten nachbauen. Bruce Ingles Aufbau hatte folgende Übersetzungen:

Most newer bikes (made since the late-1980's) have "vertical" rear dropouts, where the wheel slides upward as you install it. These are a problem when you want to dispense with a derailer, because you need some way to regulate chain tension.

dropf-comp dropf-short dropf-semivert dropf-vert

Short Semi-Vertical Dropout Vertical Dropout

dropf-stamp dropf-nohang dropf-raleigh dropf-sub

With Hanger Without Hanger Raleigh 3-speed Track Fork End

You CanNOT use any sort of pulley type chain tensioner on a fixed gear bike!

You cannot use a derailer on a fixed gear bike, even as a chain tensioner, because when you resist the rotation of the pedals, you would bend the derailer. This presents a problem if you want to use a frame with vertical dropouts as a fixed gear, because there's no easy way to adjust the chain tension. This is also true of chain tensioners sold for singlespeed coasting bikes, such as the Surly Singleator.

Even the chain tensioners used for downhill mountain bike racing are not strong enough to withstand the stress of resisting the pedals. These tensioners have to clamp on to the chainstay, which is more or less round. There is no way to make one that would be secure, short of installing some sort of brazed-on fitting.

 

Many track bicycles use a wider chain than is common on multi-speed bicycles. Derailer-type chain has a nominal internal width of 3/32". Most bicycles without derailers, including most fixed-gear bicycles, use the wider 1/8" size. You can buy fixed-gear sprockets in both widths.

There is more about chain in our article on non-derailer drivetrains. An important note: only master links for 1/8" chain can be detached and reattached without loosening the wheel -- so, 1/8" chains are easier to remove for cleaning.

This topic is addressed at more length in our article on non-derailer drivetrains.

There is more detailed information on chainline in my Bicycle Glossary's Chainline Entry and even more in my Chainline Article.

The chain tension on a fixed gear is quite critical, and is regulated by moving the rear axle back and forth in the fork ends. If the chain is too tight, the drive train will bind, perhaps only at one angle of the pedals (chainwheels are not usually perfectly concentric). It should be tight as it can be without binding. If the chain is too loose, it can fall off, which is quite dangerous on a fixed gear.

This topic is addressed at more length in our article on non-derailer drivetrains. Special equipment choices are required if the frame has vertical dropouts.

Unfortunately, fixed-gear riding is somewhat of a fringe activity from a commercial point of view, and those who have not learned to love it tend to write fixed-gear fans of as nuts and fanatics.

If you have a local bike shop that stocks fixed-gear stuff, you are in a lucky minority, and I urge you to patronize them.

* Interested in multi-speed fixed gears? See:

* The Sturmey-Archer ASC Three-Speed Fixed-Gear Hub

* Converting a Sturmey-Archer AW to Fixed Gear