Carbon transmissions… how do they hold?

Although we thought about switching to stock record chainrings by the end of September to avoid the extra wear caused by the cold, the rain and the salt coming with the winter roads,
the jockey wheels didn’t receive that much attention… They were mounted in June and ended their life a few days ago after a complete bike cleaning. Despite the thousands kilometers (about
7000km: 2007 was a very small year regarding the kilometers…), and the dirt/dust, which found refuge between the wheel and the washer, they still were functionning very well: smooth and
fluid.
Ok, they now look as ninja throwing stars instead of a bike transmission component, but for sure they could have hold a few hundreds extra kilometers without a doubt.

Here are the pictures, today on the left, and brand new on the right…

About the chainrings we have used the last summer, they still look very good after more or less 2000km. The shape of the teeth is not as regular as the first ride, but they are still
perfectly rideable. Roughly, if you are gentle with your bike, you can expect more or less 5000km. However, if you do not take care that much about your stuffs, do not hope more than 3000km
from them.

Basically, here are the most important points we found about the carbon chainrings and jockey wheels: