Colnago C64 seatpost wedge bolt specs?

Discuss light weight issues concerning road bikes & parts.
bikeboy1tr
Posts: 412
Joined: Thu Mar 21, 2013 3:19 am
Location: Southern Ontario Canada

by bikeboy1tr

I loosened my clamping mech again today and this time as I am turning the bolt I notice that the whole assembly is rising up out of the pocket that it sits in, so I continued until it was completely out of the frame and removed it. I did not smack the bolt with the heel of my hand but I did hear it pop when I was loosening the bolt. The post still doesnt adjust easily but I know its not being held by the clamp at all whatsoever. I think from here on in this will be the method of adjustment for seat height for me. I think this is one of the best clamps I have worked with in my time.
viewtopic.php?f=10&t=154188
2018 Colnago V2R Rim Brake
2014 Norco Threshold Disc Brake
2012 Time RXRS Ulteam Rim Brake
2008 Time VXR Rim Brake
2006 Ridley Crosswind Rim Brake

by Weenie


wilwil
Posts: 372
Joined: Thu Sep 23, 2010 5:47 pm

by wilwil

I torque mine to 5 NM. If it s not tight enough the post does slip down. It always needs a whack under the saddle to release it. I dont use carbon paste. Slightly annoying that you have to hold the bike vertically to insert the seatpost.

Calnago: I have ended up cabling it crossing in the downtube because the conventional way causes the gear cables to be literally sprung loaded against the headtube due to the routing into the top of the downtube. There is also the possiblity of rubbing on the top of the downtube lug. Not really a satisfactory design but I guess most people will go electronic.

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Calnago
Posts: 8608
Joined: Sun Nov 07, 2010 9:14 pm

by Calnago

@Wilwil: if I had a C64 I would for sure be crossing the cables internally, for the reasons you state. When I wrote my C64 thread back in February I specifically mocked it up to see how the routing would work out, having to make its way into the new port in the downtube, and was convinced I could do a super clean build that way. You just kind of have to make sure you’ve finalized where the bars are going to be first because it doesn’t leave as much housing for height adjustments as the Criss/crossing in front does.
BMC has a similar port for routing the cables in the downtube and they don’t have a problem displaying their bikes as such. It’s just so much better. Already had to put some clear stickers on the headtube of one guy’s C64 to prevent any further rubbing away of the finish.
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

Freewayflyer
Posts: 10
Joined: Sat Apr 07, 2018 8:31 pm

by Freewayflyer

Hi !
Reading your posts brings me to share my thoughts and questions about C64 seatpost assembly & maintanence.

Hope this will help others and me on the same issue with knowledge from other's experience.

I have not yet tried to dismount the seat post on my C64 but I intend to do so soon in order grease the the back of the wedge and the frame metal insert that it slides against when torqued and, to renew the antislipage paste on the seatpost.

It's been a year since I've bought the bike...it's time for some maintanance although it was barely ridden due to work and family obligations.

So...a few questions...just to be prepared for any situation that I may encounter...:

Has anyone had experience with Effetto Mariposa CarboGrip (spray / paste) for this or any other carbon seatpost assembly ?
It's suposed to prevent slipage and seizing as well. (I still haven't used it, only ordered it). It does not contain glass or anyother grains for friction so it does not scratch the carbon or the paint.

Also, Effetto Mariposa have a spray called CarboMove intended for freeing stuck compononents like carbon seatposts. It is some kind of solvent and lubricant that penetrates between the seat post and seat tube, lubricates the contact surfaces and disolves the antislipage paste.

Their website sais it does not harm carbon. Could it be ? I've read on other sites that grease or oil can damage the carbon resin...so what about solvents ? Has anyone used it or something similar ?

Lastly, some antislipage pastes products, among them the original Colnago antislipage paste that came with the C64 frameset sugests that clamping torques can be reduced as much as 30% when those pastes are applied to carbon assemblies.

My seatpost is torqued to 5Nm.
30% less from the 6Nm max - the wedge bolt limit is ~ 4.2 Nm.
Would you reduce it that much ?

Thanks for your thoughts !
Enjoy your C64's it rides magnificent !
Can't wait to go back riding it after some maintanence and redadjustments that need to be done.

Cheers !!!

wilwil
Posts: 372
Joined: Thu Sep 23, 2010 5:47 pm

by wilwil

I have now found my seatpost clicks without carbon paste. I haven't heard of paste that doesnt scratch so my seat post is a bit of mess below the frame line. The post is quite loose in the frame when the clamp is undone enough for it to slip down on its own accord. Im not convinced about D shaped posts although my Strava times are minutes faster. ;-)

bikeboy1tr
Posts: 412
Joined: Thu Mar 21, 2013 3:19 am
Location: Southern Ontario Canada

by bikeboy1tr

I have recently discovered that my seat clamp may not have been engaging completely as when I torqued it to 6 I felt that the head of the bolt had some small movement so I removed the assembly to double check that the wedge was sitting properly which it was and then reinstalled and same thing. I removed the wedge bolt and put a die on it to run some threads right to the underside of the bolt head. Cleaned it all up and smear paste on the post and torqued it to 5 NM instead. My post is pretty tight inside the seat tube so not much torque is needed really.
As for the paste type I cannot recall what brand it is but it came with the V2R.
viewtopic.php?f=10&t=154188
2018 Colnago V2R Rim Brake
2014 Norco Threshold Disc Brake
2012 Time RXRS Ulteam Rim Brake
2008 Time VXR Rim Brake
2006 Ridley Crosswind Rim Brake

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