Retrobike Forum Index

It is currently Sun May 31, 2020 10:18 am

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 46 posts ]  Go to page Previous  1, 2, 3, 4, 5
Author Message
PostPosted: Wed Apr 01, 2020 6:07 pm 
Dirt Disciple

Joined: Thu May 30, 2019 11:11 pm
Posts: 13
The Alan’s were glued and screwed (Apparently).
Of course threading a thin aluminium frame might weaken it too - especially over time with work hardening/glue ageing etc.

But the Pro Carbons, I think, we’re made in the Far East and imported via mid Wales... again I think.


Top
 Profile  
 
PostPosted: Wed Apr 01, 2020 6:12 pm 
Dirt Disciple

Joined: Thu May 30, 2019 11:11 pm
Posts: 13
Can’t imagine the carbon would be threaded as that would be rather tricky to mould in or die cut!


Top
 Profile  
 
PostPosted: Wed Apr 01, 2020 6:32 pm 
Retro Guru

Joined: Sun Feb 03, 2019 5:55 pm
Posts: 295
You'll notice there's a difference between my frame and also the spare one that's cracked. Cable lugs are also under the top tube on the cracked frame too so it must be an earlier frame, it also looks like someone has scratched up the aluminium in the past to provide a key before painting over it in gold.

Image
Image
Image
Image

Image
Image


Top
 Profile  
 
PostPosted: Wed Apr 01, 2020 7:34 pm 
Dirt Disciple

Joined: Thu May 30, 2019 11:11 pm
Posts: 13
Great investigative pics and the older one looks like a copy of a traditional steel BB shell set up... but being Ally has obviously worn more with cables.

I wonder if that nasty crack could have been caused by vaulting/landing on a log?
Or I remember that I bought a clamp/strap-on chainset bash-bar thingy (luckily for my previous Overbury’s Crossfell steel bike) that was designed to protect the expensive BioPace chainset teeth, but would actually have transferred shock to the underside of the down tube (scary add-on accessory on reflection).
Thanks for sharing though.
I’d still say glued not screwed and glued for carbon tube though !


Top
 Profile  
 
PostPosted: Wed Apr 01, 2020 8:21 pm 
Retro Guru

Joined: Sun Feb 03, 2019 5:55 pm
Posts: 295
N+1+1 wrote:
Great investigative pics and the older one looks like a copy of a traditional steel BB shell set up... but being Ally has obviously worn more with cables.

I wonder if that nasty crack could have been caused by vaulting/landing on a log?
Or I remember that I bought a clamp/strap-on chainset bash-bar thingy (luckily for my previous Overbury’s Crossfell steel bike) that was designed to protect the expensive BioPace chainset teeth, but would actually have transferred shock to the underside of the down tube (scary add-on accessory on reflection).
Thanks for sharing though.
I’d still say glued not screwed and glued for carbon tube though !


I stuck my finger into the tubes and couldn't feel anything that resembled threads so I'm inclined to agree that they are just glued. I'm going to clean out all the dirt from in there and see if anything is visible.

I also spoke to a couple of specialists who said the crack is most likely from an impact as there shouldn't be any reason why the carbon itself would fail even after all these years.


Top
 Profile  
 
PostPosted: Wed Apr 01, 2020 8:53 pm 
Dirt Disciple

Joined: Thu May 30, 2019 11:11 pm
Posts: 13
The threads would be on the outside, with internal matching threads in the Ally lugs, so your unlikely to feel them.
The Alan’s were threaded LH & RH so that they’d pull in both lugs (with matching threads) along with adhesive to prevent unwinding.
I’d guess ours just have shoulders on the tubes and with adhesive added on the ends are just pushed in, clamped in a jig for trueness while they set solid.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 46 posts ]  Go to page Previous  1, 2, 3, 4, 5

All times are UTC [ DST ]


Who is online

Users browsing this forum: Matty538, SpecializedSworks15 and 47 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

About Us

Follow Retrobike

Other cool stuff

All content © 2005-2015 Retrobike unless otherwise stated.
Cookies Policy.
bikedeals - the best bike deals in one place
FatCOGS - Fat Chance Owner's Group

Powered by phpBB® Forum Software © phpBB Group