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PostPosted: Mon Jul 28, 2014 5:43 pm 
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Joined: Thu Sep 13, 2012 11:25 pm
Posts: 118
Location: Ontario, Canada
I'm in the process of building up a Trek Domane. I have a Fizik R3 Antares saddle with Kium rails, I don't have the Bontrager seat mast yet. Will the Kium rails fit the Bontrager seat mast without any issues, or will I need a larger clamp to make it work?

Reading around online it appears as though the Fizik Antares carbon railed saddles will have issues, but I'm unsure about the Kium railed saddles. I know the carbon rails are a larger diameter. Just placing my Kium saddle next to the Antares carbon saddle on my Merckx I can see the difference.


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PostPosted: Mon Jul 28, 2014 8:16 pm 
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Joined: Fri Jul 23, 2004 8:24 pm
Posts: 1740
Location: Houston, Texas
Although Bontrager makes seat clamps specifically for use with saddles with 7x9/7x10 rails such as some Bontrager saddle models as well as the Fizik saddles with braided carbon rails, typically the seat mast comes standard with clamps for round/oval rails. My open mold TT bike came with the same exact saddle clamp for round rails as the Madone which worked fine when I was riding a Fizik Tundra saddle with K:ium rails. When I got a Fizik Tundra carbon model with braided carbon rails, I had to also swap the clamps with the ones for 7x9/7x10 rails for the new saddle to fit.

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PostPosted: Tue Jul 29, 2014 2:12 am 
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Joined: Thu Sep 13, 2012 11:25 pm
Posts: 118
Location: Ontario, Canada
Here is a pic of the two saddles.

So I take it I don't need a larger clamp with the Kium rails?

Image


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PostPosted: Tue Jul 29, 2014 2:28 pm 
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Joined: Fri Jul 23, 2004 8:24 pm
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Location: Houston, Texas
Is this a new purchase or acquired from a previous owner? If new and the bike is supplied with one of the Bontrager saddles with alloy rails you should be fine.

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PostPosted: Tue Jul 29, 2014 6:04 pm 
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Joined: Thu Sep 13, 2012 11:25 pm
Posts: 118
Location: Ontario, Canada
The saddle is a new purchase, and the bike frame it is going on is new (warranty replacement from Trek). But Trek just sent me the frame, fork, and bearings; no saddle.


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PostPosted: Tue Jul 29, 2014 6:56 pm 
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Joined: Fri Aug 09, 2013 1:10 pm
Posts: 36
I have a Fizik Aliante VS K:IUM on the seat mast on my 2014 Trek Madone 7 Series. It all works fine.


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