Guiding the lower part of the chain


I've found that the lower part of the chain does come considerably close to the ground when using a normal long arm derailleur on a 20" bike frame. A short arm derailleur is much better but may not be able to be used with the range of gearing. This is most prominent over bumps and when changing gear and this can be rectified in one of these ways:











Thursday, 29 January 2009