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Evaluating Rear Derailers

Rear derailers sometimes wear out, but usually if they are bad it's because they're missing parts. Check for these parts, and if they're there, you can say it's OK.

In the lower left is the barrel adjuster where the cable housing stops. Some derailers don't have this part, but will instead have a hollow area where the housing fits. If there is a hole with threads on the inside, and nothing screwed into it, the derailer is missing something.

The two similar screws limit the derailer's travel, and the other circled screw holds the cable in place.

Also very important, although it isn't circled, is that the derailer must have both of its pulley wheels.

There are also some rear derailers which have removable bolts to attach them to the frame. The bolt in this picture is at the upper left corner of the derailer. If this part of the derailer is hollow instead of having a bolt, the derailer is missing a part.

Created by: pgarver. Last Modification: Saturday 25 of February, 2006 05:23:13 UTC by pgarver.