2020 Domane Seat Mast... Begging for Water in Frame?
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  1. #1
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    Question 2020 Domane Seat Mast... Begging for Water in Frame?

    While I love my 2020 Domane SL7 Disc, I can't help but think that the seat post design is just begging for water and dirt to get into the frame. The binder bolt to tighten the seat post mast is a giant slot in the back of the seat tube which is a primo-place for overspray from the rear tire to go:



    I think it would be nice if Trek devised a rubber "plug" for this hole to help keep water out, similar to the plug on the chain stay for the DuoTrap sensor:



    Can you think of a way to seal that hole, but still allow access to it in the event that I need to remove or adjust my seat post?

    I considered just putting some kind of tape over the whole, but obviously that would mean a new piece of tape each time I adjusted or removed the seat post, not to mention the build-up of tape residue.
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  2. #2
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    Fenders.
    Too old to ride plastic

  3. #3
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    Quote Originally Posted by velodog View Post
    Fenders.
    Yeah, I guess that's one option!

  4. #4
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    There is a little plug that should be on the end of the seatpost. It's called the seatpost "tail". Part #W581152. That little piece is designed to keep water out of the frame. It should have been installed by the shop, or provided to you when you got the bike.

  5. #5
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    Yup, the rubber plug is installed in the base of the seat post mast. Seems like an odd solution to the problem, however. I'd rather keep dirt and water out of the frame and seat tube entirely rather than have it collect in the seat post

  6. #6
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    If it was my bike, I'd simply put a piece of electrical tape over that. Not the most elegant but gets the job done.

  7. #7
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    How about applying some sort of release agent and then filling the slot with silicone or sumsuch forming a removable plug? It may work but as long the release agent works there is no damage if it doesn't work.
    Just test that the release agent works with what ever you use to form the plug before attempting on the bike. If it works some sort of "tail" could be embedded into the silicone, making removal easy.
    Too old to ride plastic

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