Just got off the trainer, noticed my seat was creaking a lot. When I looked I saw that this rubber support under the curved part of the seat post is starting to fall apart. Almost like dry rot? Little pieces were all over the floor.
Does anyone know the function of this piece or what it's called? Is it safe to continue riding like this? Is it something I can get replaced or would I have to replace the entire seat post?
This is on a 2017 Specialized Roubaix SL4, in case that matters.
by widdershins_4897
3 Comments
You can remove it, that thing doesn’t really do anything. The seatpost will be fine.
It’s a “Zertz” insert (Specialized branding term). They are elastomeric dampers that are supposed to reduce road vibration in combination with flexible carbon element (seat post, seat stay, fork).
In theory you can replace some of them on certain models, not sure about that post model. But they can be a total pain to source.
I seem to recall Specialized saying NO ZERTZ fittings were structural. So… agree you can remove entirely.