Bontrager seatpost rotary clamp/ears (+SLR carbon rails)

Discuss light weight issues concerning road bikes & parts.
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sanrensho
Posts: 410
Joined: Tue Aug 02, 2011 5:54 pm

by sanrensho

Does anybody happen to know the weight of the rotary clamp hardware (ears + bolt + rotary clamp) for Bontrager seatposts?

Also, Bontrager lists two optional ears for carbon oval rails: 7x9mm and 7x10mm. Is the 7x9mm a better choice for Selle Italia SLR carbon rails (7x9.6mm)?

Thank you.

FIJIGabe
Posts: 1400
Joined: Tue Sep 11, 2012 6:07 pm
Location: The Lone Star State

by FIJIGabe

If I remember correctly from my build, it's 12g.

For your saddle, I'd go 7x10.
Madone 9 https://goo.gl/7UwZpV
Crockett https://goo.gl/f5PdCN
Madone 5 https://goo.gl/cMdyFo

Madone 4, Cobia. I own a lot of Treks.

sanrensho
Posts: 410
Joined: Tue Aug 02, 2011 5:54 pm

by sanrensho

^^^Thanks FIJIGabe. Is that weight for the ears only? Because I think all the loose parts weigh a bit more (ears, bolt, spring, rotary clamps).

FIJIGabe
Posts: 1400
Joined: Tue Sep 11, 2012 6:07 pm
Location: The Lone Star State

by FIJIGabe

Sorry, I was really off. The weight of the ears is 29g for the 7x10 versus 21g for the standard 7x7 version.

Image


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Madone 9 https://goo.gl/7UwZpV
Crockett https://goo.gl/f5PdCN
Madone 5 https://goo.gl/cMdyFo

Madone 4, Cobia. I own a lot of Treks.

sanrensho
Posts: 410
Joined: Tue Aug 02, 2011 5:54 pm

by sanrensho

Thanks! I wish someone would make a lightweight version of the rotary clamp hardware.

erwizy4p5
Posts: 34
Joined: Tue Nov 20, 2012 7:50 pm

by erwizy4p5

I wish someone would too

Wildh
Posts: 36
Joined: Fri Apr 01, 2016 6:11 pm

by Wildh

Fiji... Did you use that style clamp on the madone 9? Frustrated they don't make a 7x9mm....

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

by Calnago

sanrensho wrote:Does anybody happen to know the weight of the rotary clamp hardware (ears + bolt + rotary clamp) for Bontrager seatposts?

Also, Bontrager lists two optional ears for carbon oval rails: 7x9mm and 7x10mm. Is the 7x9mm a better choice for Selle Italia SLR carbon rails (7x9.6mm)?

Thank you.
I just put an SLR saddle on a Bontrager seatpost yesterday. Used the 7x10 ears. I think that’s what you want to go with. No stress risers. No slip. I marked everything before a good long ride. Used gritty carbon paste in the clamps at the rails and torqued it down to 10Nm and used Loctite 222 (purple) on the threaded clamp bolt. I use a bit of Morgan Blue AquaProof Paste between the cups and the hole in the seatpost.
This is not a Madone however. Are the Madones different? Fijigabe could answer that.
I have 7x9 ears as well (for Specialized saddles). How do the Madone seatmast differ (at the saddle clamp) from the others, like for the Domane say, or the Emonda?
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

Wildh
Posts: 36
Joined: Fri Apr 01, 2016 6:11 pm

by Wildh

The madone is different i think and also uses different style ears. Not sure if the are cross compatible. I ordered the 7x10mm ones but they are on backorder from Trek until mid July. Silly. Might just order ti rails and send the carbon one back.

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

by Fisherfreerider

Madone clamp is different and they are not interchangable.

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nickf
Posts: 577
Joined: Sat Mar 06, 2010 10:34 pm

by nickf

Wildh wrote:
Thu May 24, 2018 12:45 am
The madone is different i think and also uses different style ears. Not sure if the are cross compatible. I ordered the 7x10mm ones but they are on backorder from Trek until mid July. Silly. Might just order ti rails and send the carbon one back.
They are back in stock. Showing 50+ in the system. W524901 Trek Madone 9-Series Aero Seatpost Clamp Ears 10mm Oval

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