C64 headset?

Discuss light weight issues concerning road bikes & parts.
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wilwil
Posts: 375
Joined: Thu Sep 23, 2010 5:47 pm

by wilwil

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The C64 ships with an Acros plastic headset. The compression ring has to sit right down on the bearing in order for the top cap to fit properly. This fine when there is no fork steerer running through it. I have struggled for hours to push it all the way but its just too tight. I have contacted Acros and they just said I havent pushed it into the bearing far enough. This I already know. Why cant I push it into the bearing? Its pretty crappy and Im frightened of damaging it. So is the steerer diameter out of tolerance? Unless I can solve this I can not build this bike. Am I missing a trick?
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by Weenie


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

by Calnago

Make sure the ring is nicely lubed up. Insert the fork steerer all the way, without the compression ring installed. Then slide the compression down the steertube and carefully center it slowly and evenly in the bearing. Use the flat side of a small flathead screwdriver to lightly go around the whole circumference to get it started. If you just jam in one side that will make it cockeyed and hard, or impossible, to get the other side started. Be gentle, sounds like this is your first time :) . Once you're certain that the entire edge circumference is started between the steerer and the bearing then just keep going around with the flat side of the screwdriver and pushing down until it's fully inserted. It should be snug.
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

wilwil
Posts: 375
Joined: Thu Sep 23, 2010 5:47 pm

by wilwil

I started off being very gentle but soon got carried away! I have tried your technique. Its just too snug. I will try again. Plenty of lube by the way

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

by Calnago

I suppose we can all get a bit "carried away" our first time, it can be very exciting. I just hope you didn't damage the edge of the compression ring in your eagerness to jam it in. Take a break... have a coffee... come back more relaxed and try again. Say "ooohmmmmm" out loud with your fingers raised in a cupping fashion to the stars, oh, and legs crossed.
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

wilwil
Posts: 375
Joined: Thu Sep 23, 2010 5:47 pm

by wilwil

Calnago wrote:
Thu Oct 04, 2018 6:42 pm
I suppose we can all get a bit "carried away" our first time, it can be very exciting. I just hope you didn't damage the edge of the compression ring in your eagerness to jam it in. Take a break... have a coffee... come back more relaxed and try again. Say "ooohmmmmm" out loud with your fingers raised in a cupping fashion to the stars, oh, and legs crossed.
I managed to push it in in the end and didnt get too over excited. It carried on sinking in on the maiden voyage so had to adjust the headset a couple of times. The gap between top cap and headtube is now about 1-1.5 mm which is much better.

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wheelsONfire
Posts: 3005
Joined: Mon Jul 07, 2014 8:15 am
Location: NorthEU

by wheelsONfire

Plastic!!?
Why not alu in such an expensive frame?
Bikes:

Ax Lightness Vial EVO Race (2018.12.21)
viewtopic.php?f=10&t=156137
Paduano Racing Fidia (kind of shelved)
Open *UP* (2016.04.14)


Ex bike; Vial EVO D

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alistaird
Posts: 203
Joined: Thu Jul 21, 2016 8:21 pm

by alistaird

wilwil wrote:
Sat Oct 06, 2018 1:42 pm
Calnago wrote:
Thu Oct 04, 2018 6:42 pm
I suppose we can all get a bit "carried away" our first time, it can be very exciting. I just hope you didn't damage the edge of the compression ring in your eagerness to jam it in. Take a break... have a coffee... come back more relaxed and try again. Say "ooohmmmmm" out loud with your fingers raised in a cupping fashion to the stars, oh, and legs crossed.
I managed to push it in in the end and didnt get too over excited. It carried on sinking in on the maiden voyage so had to adjust the headset a couple of times. The gap between top cap and headtube is now about 1-1.5 mm which is much better.
This is interesting - any chance you took photos of the successful install to match the two pictures earlier where you had a problem? I'm always interested to learn from these installs in case I run into similar problems.

Thanks

A

wilwil
Posts: 375
Joined: Thu Sep 23, 2010 5:47 pm

by wilwil

wheelsONfire wrote:
Sun Oct 07, 2018 11:40 am
Plastic!!?
Why not alu in such an expensive frame?
Just because its plastic doesn't make it cheap. I think this particular compression ring costs £12

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

by Calnago

The polymer compression ring, or delrin/nylon or whatever it is made of, is an actual improvement over the alloy compression rings in that it provides a dampening effect for the steertube. But yes, when I first saw the change (on the C60), I thought the same thing, and wondered whether it would wear out faster, etc. It hasn't. It's a snug fit and seems to do what it's supposed to do, and I can certainly appreciate that the delrin edge is less likely to be the source of any stress risers where the edge meets the steertube. I've certainly seen indentations and scoring on steertubes where the compression rings have left their mark. Also, the actual flange of the upper headset cup is also made of polymer, by design, intended to reduce the shock and dampen the ride up front. That's a stretch, and I talked about it in my C64 thread, but I suppose it does provide some dampening over a solid alloy flange. Noticeable... probably not. But hey, the word of decade is "marginal", so however small of a difference it makes, I guess it counts.
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

wilwil
Posts: 375
Joined: Thu Sep 23, 2010 5:47 pm

by wilwil

The ring for the C64 also has a built in seal that spreads itself across the bearing.

by Weenie


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