Trek domane/emonda seat mast cap - weight weenie clamp

Discuss light weight issues concerning road bikes & parts.
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alcatraz
Posts: 930
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

Hey WW's

Is there anyone here familiar with the trek seat mast cap and has replaced the actual tube clamp with something else?

I saw a nice looking picture of an emonda seat mast cap (seems to fit domane) but with a carbonice clamp instead of the standard clamp. I wonder if the tube had to be cut and shortened above the original clamp to do this.

I tried removing the clamp from the seat mast but it's really stuck there.

Is it glued on or what? Thanks for any input..

I measured the diameter of the mast to 34.3-34.5mm and thus a 34.9mm clamp should fit although not perfectly. There are cheap clamps out there at around the 10gr mark.

/a

Fisherfreerider
Posts: 156
Joined: Thu Sep 29, 2011 1:19 am

by Fisherfreerider

What you saw is the SLR 10 seat mast cap that Trek makes. They are 92g in the 175 length and 70g in the short.

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Calnago
Posts: 6069
Joined: Sun Nov 07, 2010 9:14 pm

by Calnago

And yes, those collars are glued on, which I’m not really fond of. I would much rather those collars be able to move so as you tighten them it provides a more uniform force around the entire tube, as if you were tightening a rope around it, versus a “clamping” effect. I think they’re just glued on to ensure they stay in that relative position since the glue seems to be really just a dab at some spot versus having been carefully applied all the way around.
Colnago C64 - The Naked Build; Colnago C60 - PR99; Trek Koppenberg - Where Emonda and Domane Meet;
Unlinked Builds (searchable): Colnago C59 - 5 Years Later; Trek Emonda SL Campagnolo SR; Special Colnago EPQ

alcatraz
Posts: 930
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

I'm thinking to simply cut the mast just next to the clamp. The slit is long enough to use after, unchanged.

Then just put a generic 10gr 34.9mm clamp on the mast instead.

I could save like 20gr maybe. Smart or foolish?

I have the short seat mast. Cutting 15mm off it won't affect it I think. What do you think?

/a

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Calnago
Posts: 6069
Joined: Sun Nov 07, 2010 9:14 pm

by Calnago

Personally I would leave it as is. Two places I have no desire to skimp on function and strength are skewers and seatpost clamps.
Colnago C64 - The Naked Build; Colnago C60 - PR99; Trek Koppenberg - Where Emonda and Domane Meet;
Unlinked Builds (searchable): Colnago C59 - 5 Years Later; Trek Emonda SL Campagnolo SR; Special Colnago EPQ

Scarpa
Posts: 72
Joined: Wed Sep 13, 2006 3:43 pm

by Scarpa

I have one post made from carbon. If you are interested in just send a PM.


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apctjb
Posts: 59
Joined: Mon Oct 30, 2017 11:27 pm

by apctjb

I'm thinking to simply cut the mast just next to the clamp. The slit is long enough to use after, unchanged.
I was thinking the same and bought a 10g clamp; that was before I discovered the existing clamp was glued on. I may cut it off as well.

I also replaced the stock "ears" that grab the seat rails with ones I got on ebay with a titanium bolt. Shaved a few grams and the ears worked with the 7x10 rails on my new saddle.

alcatraz
Posts: 930
Joined: Mon Aug 29, 2016 11:19 am

by alcatraz

apctjb wrote:
Sun Dec 24, 2017 2:42 am
I'm thinking to simply cut the mast just next to the clamp. The slit is long enough to use after, unchanged.
I was thinking the same and bought a 10g clamp; that was before I discovered the existing clamp was glued on. I may cut it off as well.

I also replaced the stock "ears" that grab the seat rails with ones I got on ebay with a titanium bolt. Shaved a few grams and the ears worked with the 7x10 rails on my new saddle.
If you do cut the mast please let me know how it went.

The bike I'm working on is not mine and the owner decided to wait a little. Maybe later..

I'm curious to know what the weight of the clamp + 10-15mm of the mast actually weighs. What's the benefit sort of speak.

Thanks for writing

/a

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