7x9 Carbon Rails- Mtbr.com
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  1. #1
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    7x9 Carbon Rails

    I just ordered a new seat (Bontrager Evoke RXL Carbon) that apparently has 7x9 rails. I read that some seatposts wont' work with said rails.

    I've done some searching, and can't seem to find any concrete info to help me understand why.

    I'm assuming 7x9 means the rails are oval shaped, 7mm wide by 9mm tall?

    I'm further assuming that this means you need a seatpost with a "top and bottom" clamp, vs a center with 2 side clamps?

    Can anyone fill me in?
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  2. #2
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    I have this saddle and love it. I am using a bontrager xxx 27.2 seatpost. There are clamps available for it specifically for those rails as well as standard.

    G
    You can't depend on honest answers from dependant hands...

  3. #3
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    will it work with post with regular top down clamp -Easton EC90?

  4. #4
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    Pretty sure any top & bottom clamp seatpost will work with the 7x9 rails, as long as there is enough thread in the screws (which is pretty likely).

    EDIT: The seat is fantastic, I highly recommend it.
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  5. #5
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    i see you have Reverb post which has top/bottom clamp.
    is this saddle really that light?

  6. #6
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    Yes I do.

    Yes it is, actual weight for mine was 146g, and it's at least as comfortable as the normal evoke saddle.

    It's actually one of those comically light things. Picking it up is like "wtf, this can't be this light..."

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  7. #7
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    thanks, i was thinking about getting Specialized saddle but RXL is lighter and without big S logo.

  8. #8
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    Just make sure to get sized at a bontrager dealer, there are 3 widths.

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  9. #9
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    i got sized few months ago but have to do it again at different dealer (their tool was worn out).

  10. #10
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    is yours black or white?
    For some reason site lists white as heavier? Strange....

  11. #11
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    Black
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  12. #12
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    Both EC90 and Reverb will work fine with 7x9 carbon rails. Doesn't mean your rails won't break though. The only saddle I have ever broken the rails on was a Fizik Tundra carbon. It didn't break anywhere near the clamp, both bends in the rail broke. It started to creak, then felt mushy. Used numerous titanium rail saddles, some hollow, and never broke or bent rails.

  13. #13
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    Quote Originally Posted by kroe View Post
    Both EC90 and Reverb will work fine with 7x9 carbon rails. Doesn't mean your rails won't break though. The only saddle I have ever broken the rails on was a Fizik Tundra carbon. It didn't break anywhere near the clamp, both bends in the rail broke. It started to creak, then felt mushy. Used numerous titanium rail saddles, some hollow, and never broke or bent rails.
    Funny, Fizik advertises their carbon rails are significantly stronger then their metal rails. They stand behind that claim with their warranty as well if you ever have a problem.
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  14. #14
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    Quote Originally Posted by DavidR1 View Post
    Funny, Fizik advertises their carbon rails are significantly stronger then their metal rails. They stand behind that claim with their warranty as well if you ever have a problem.
    They do stand behind their products, and I would buy another in a minute. They replaced my Tundra with a Tundra 2 no questions asked (I didn't crash it or anything, but it was nice that they didn't make me go hunting for receipts).

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