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re ahead headset bearings



 
 
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  #1  
Old September 16th 06, 06:18 PM posted to uk.rec.cycling
geepeetee
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Posts: 9
Default re ahead headset bearings

Hi

I am intrigued now, the headset really doesn't have bearings. The headtube
is slightly conical at both ends and a circular split bush compresses into
the headtube when the central allen screw is tightened. I have googled for
it but cant find any info or images.

The bike is a trek 7200 hybrid.

thanks

Gary

--
Visit my websites at
www.justjents.co.uk
www.recumbent.50megs.com


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  #2  
Old September 16th 06, 06:59 PM posted to uk.rec.cycling
Pete Biggs
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Posts: 1,801
Default re ahead headset bearings

geepeetee wrote:
Hi

I am intrigued now, the headset really doesn't have bearings.


I don't believe that. Have you removed the stem and forks yet to look
inside?

The
headtube is slightly conical at both ends and a circular split bush
compresses into the headtube when the central allen screw is
tightened. I have googled for it but cant find any info or images.

The bike is a trek 7200 hybrid.


Integrated headset?
http://www.parktool.com/repair/readhowto.asp?id=68

Do you really mean head tube or steer tube?

Does it have anything like this:
http://www.chainreactioncycles.com/M...x?ModelID=2741 ?

~PB


  #3  
Old September 16th 06, 07:09 PM posted to uk.rec.cycling
Paul Boyd
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Posts: 155
Default re ahead headset bearings

On 16/09/2006 18:18, geepeetee said,
I am intrigued now, the headset really doesn't have bearings. The headtube
is slightly conical at both ends and a circular split bush compresses into
the headtube when the central allen screw is tightened. I have googled for
it but cant find any info or images.


*ALL* headsets use bearings, AFAIK. Are you able to take photos
yourself of what you have, and post them somewhere?

--
Paul Boyd
http://www.paul-boyd.co.uk/
  #4  
Old September 16th 06, 07:12 PM posted to uk.rec.cycling
Pete Biggs
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Posts: 1,801
Default re ahead headset bearings

Actually, from the description it sounds more like it has this sort of
thing:

http://www.chainreactioncycles.com/M...x?ModelID=2218

- Used for pressing the the stem down, which in turn loads the headset
beaings.

Apologies if I'm egg-suck teaching.

~PB


  #5  
Old September 17th 06, 12:39 AM posted to uk.rec.cycling
Rob Morley
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Posts: 7,173
Default re ahead headset bearings

In article
Paul Boyd wrote:
On 16/09/2006 18:18, geepeetee said,
I am intrigued now, the headset really doesn't have bearings. The headtube
is slightly conical at both ends and a circular split bush compresses into
the headtube when the central allen screw is tightened. I have googled for
it but cant find any info or images.


*ALL* headsets use bearings, AFAIK. Are you able to take photos
yourself of what you have, and post them somewhere?


Some small-wheelers have a ball race at the bottom and a nylon bush at
the top.
  #6  
Old September 17th 06, 08:12 AM posted to uk.rec.cycling
squeaker
external usenet poster
 
Posts: 289
Default re ahead headset bearings


geepeetee wrote:
Hi

I am intrigued now, the headset really doesn't have bearings. The headtube
is slightly conical at both ends and a circular split bush compresses into
the headtube when the central allen screw is tightened. I have googled for
it but cant find any info or images.

The bike is a trek 7200 hybrid.

thanks

Gary

--
Visit my websites at
www.justjents.co.uk
www.recumbent.50megs.com


Try harder :{
http://www.trekbike.co.uk/2007/bikes...ID= 16&ID=255
says:HEADSET: VP semi-cartridge

  #7  
Old September 18th 06, 08:49 AM posted to uk.rec.cycling
James Thomson
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Posts: 80
Default re ahead headset bearings

"Pete Biggs" a écrit:

Actually, from the description it sounds more like it has this sort of
thing:


http://www.chainreactioncycles.com/M...x?ModelID=2218


- Used for pressing the the stem down, which in turn loads the
headset beaings.


Apologies if I'm egg-suck teaching.


I think you're probably misreading between the lines.

"The headtube is slightly conical at both ends and a circular split bush
compresses into the headtube when the central allen screw is tightened."

Many threadless headsets one or more split conical compression rings to
provide radial preload when the top bolt is tightened. In a cartridge
bearing headset, the lower ring often replaces the crown race.

The Trek site says "VP semi cartridge":

http://www.trekbike.co.uk/2007/bikes...ID= 16&ID=255

and shows a headset with external cups and a tall conical spacer:

http://www.trekbike.co.uk/2006/bike_images/07_7200.jpg

http://www.bicyclestore.com.au/files...ges/d_2338.jpg

The VP site shows a similar looking headset, the Slimstak:

http://www.vpcomponents.com/images/ProdAD2.jpg

http://www.vpcomponents.com/headset_show.asp?pid=40

It's called semi-integrated beacause the cups sit flush with the head tube,
but it's basically a conventional Aheadset.

James Thomson


  #8  
Old September 18th 06, 09:09 AM posted to uk.rec.cycling
James Thomson
external usenet poster
 
Posts: 80
Default re ahead headset bearings

Paul Boyd wrote:

*ALL* headsets use bearings, AFAIK.


"Rob Morley" a écrit:

Some small-wheelers have a ball race at the bottom and a nylon
bush at the top.


Raleigh Twenties being a common example. Of course it's still a bearing,
just not a ball bearing.

There was a plastic headset in the early eighties that used, IIRC, Delrin
cups and PTFE bushes top and bottom. I don't recall the brand, but they
didn't stay long on the market.

James Thomson



  #9  
Old September 18th 06, 01:18 PM posted to uk.rec.cycling
Rob Morley
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Posts: 7,173
Default re ahead headset bearings

In article
James Thomson wrote:
Paul Boyd wrote:

*ALL* headsets use bearings, AFAIK.


"Rob Morley" a écrit:

Some small-wheelers have a ball race at the bottom and a nylon
bush at the top.


Raleigh Twenties being a common example. Of course it's still a bearing,
just not a ball bearing.

Indeed - but when most people say 'bearings' they mean 'balls' :-)
  #10  
Old September 18th 06, 01:35 PM posted to uk.rec.cycling
Pete Biggs
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Posts: 1,801
Default re ahead headset bearings

James Thomson wrote:

I think you're probably misreading between the lines.


You must be right.

Sorry Gary. Please ignore my replies on the subject.

~PB


 




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