Retrobike Forum Index

It is currently Tue Dec 06, 2016 9:21 pm

* Login   * Register * Search  * FAQ



Post new topic Reply to topic  [ 19 posts ]  Go to page 1, 2  Next
Author Message
PostPosted: Fri Aug 17, 2012 1:12 pm 
Retro Guru

Joined: Thu May 03, 2012 7:56 pm
Posts: 264
Hi folks,

The frame I got which arrived here yesterday seems to have a very shallow threaded bottom bracket - that is, the width of the threads only seems to be about half the width of the cups I've got.

Trying to fit an Athena BB - taken off a bike with a 68mm bb, the same as the bike I want to fit it to.

Whats the story with that?


Top
 Profile  
 
 Post subject:
PostPosted: Fri Aug 17, 2012 5:37 pm 
Old School Grand Master
User avatar

Joined: Fri Oct 14, 2011 8:41 pm
Posts: 8231
Location: Cumbria
You mean the pitch of the thread is wrong?

Shaun


Top
 Profile  
 
 Post subject:
PostPosted: Fri Aug 17, 2012 5:48 pm 
Retro Guru

Joined: Mon Feb 01, 2010 8:57 pm
Posts: 774
You only need 6 turns for full mechanical engagement - if you can screw the cups right in then it'll be OK. Your problem is that if the threads finish blind, ie you can't screw the cups in - you could get the cups turned down?


Top
 Profile  
 
 Post subject:
PostPosted: Fri Aug 17, 2012 5:54 pm 
Retro Guru

Joined: Thu May 03, 2012 7:56 pm
Posts: 264
No the pitch is fine.

The problem is that I get to the end of the threads before the cups are all the way in. It can't be as simple as cutting the cups down?


Top
 Profile  
 
 Post subject:
PostPosted: Fri Aug 17, 2012 6:22 pm 
Retro Guru

Joined: Thu May 03, 2012 7:56 pm
Posts: 264
Here's a picture

Image

Bit of a fag to be honest, I was hoping to have it up and running today - albeit with out a front mech. I'm holding the cup more or less below where the threads end - if that isn't clear.


Top
 Profile  
 
 Post subject:
PostPosted: Fri Aug 17, 2012 8:31 pm 
Old School Grand Master
User avatar

Joined: Fri Oct 14, 2011 8:41 pm
Posts: 8231
Location: Cumbria
Didn't the Centaur / Athena range from the late 80's have only about 10 threads before a raised lip that takes the end of the cup away from the inside of the BB...... either that or get a LBS just to run a few more threads down the BB.

I'll have a google LOL

Shaun


Top
 Profile  
 
 Post subject:
PostPosted: Fri Aug 17, 2012 8:37 pm 
Retro Guru

Joined: Thu May 03, 2012 7:56 pm
Posts: 264
I've bought a chorus bb now - the one it had in before it was sold to me do that's that.


Top
 Profile  
 
 Post subject:
PostPosted: Fri Aug 17, 2012 10:10 pm 
Old School Grand Master
User avatar

Joined: Fri Oct 14, 2011 8:41 pm
Posts: 8231
Location: Cumbria
http://velobase.com/ViewComponent.aspx? ... &AbsPos=14

Something like the above ? the pic shows that the threads are very short and are almost hidden by the cardboard packaging...

Shaun

PS

Nice looking bottom bracket, interesting that there is no strengthener between the chainstays by the BB shell....who made it? Just curious.


Top
 Profile  
 
 Post subject:
PostPosted: Fri Aug 17, 2012 10:21 pm 
Retro Guru

Joined: Thu May 03, 2012 7:56 pm
Posts: 264
I think it's a sealed BB - looking online it seems some of them do have more threading than others.

The BB is a cinelli, embossed with their logo. Have to say it is a nice thing. The frame is a Dave Marsh LowPro in 753r.

edit: forgot to say I don't think you would be able to get a wheel on it if there was a brace - horizontal drop outs and the tolerances are quite tight

Image


Top
 Profile  
 
 Post subject:
PostPosted: Fri Aug 17, 2012 11:03 pm 
Old School Grand Master
User avatar

Joined: Fri Oct 14, 2011 8:41 pm
Posts: 8231
Location: Cumbria
My back couldn't cope with that now :) Looks like a pink reynolds 753r sticker :)

A later frame than imagined from the pic so not surprised an older BB cup might not fit, glad you got it sorted :D

Cheers

Shaun


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 19 posts ]  Go to page 1, 2  Next

All times are UTC [ DST ]


Who is online

Users browsing this forum: 57EVE, Jamiedyer and 35 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