Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About Impressum
It is currently Mon Sep 26, 2016 4:44 am
Recently the board software has been updated and there are some known bugs/failures:
- Avatars are currently not being displayed ✔ FIXED
- Tapatalk connection is currently broken ✔ FIXED
- Avatars cannot be uploaded ✔ FIXED

Please note that we will soon do some changes in WW board template design in case to get a fully mobile/desktop responsiveness board!
If you find more errors please post it here: http://weightweenies.starbike.com/forum/viewtopic.php?f=7&t=139062


All times are UTC+01:00





Post new topic  Reply to topic  [ 8 posts ] 
Author Message
PostPosted: Fri Nov 16, 2012 10:37 am 
Offline
Administrator
User avatar

Joined: Sat Jun 19, 2004 11:08 am
Posts: 6783
Location: Urbana, Illinois
I'm curious to see if anyone know how this standard came to be? It seems like pedals the threading should be the opposite direction so that the motion would be in the tightening direction and not the direction that loosens the bottom bracket.

_________________
RESIDENT GRUMPY OLD MAN.


Top
   
PostPosted: Fri Nov 16, 2012 12:09 pm 
Offline

Joined: Wed Mar 28, 2007 12:49 pm
Posts: 1594
Location: Near Horgen, Switzerland
No, if you think about the forces dragging on the cup, the pedalling forces tighten an English threaded cup. Try riding a slightly loose Italian cup you will find the RHS fixed cup comes undone in minutes. After one experience on an Italian (i.e. normal thread both sides of the frame) you would quickly develop the English standard!


Top
   
Posted: Fri Nov 16, 2012 12:09 pm 


Top
   
 
PostPosted: Fri Nov 16, 2012 1:30 pm 
Offline
User avatar

Joined: Mon Jan 23, 2006 6:35 am
Posts: 5072
Location: New York
I'd rather have the bigger properly torqued Italian cups! :mrgreen:

_________________
I never took drugs to improve my performance at any time. I will be willing to stick my finger into a polygraph test if anyone with big media pull wants to take issue. If you buy a signed poster now it will not be tarnished later. --Graeme Obree


Top
   
PostPosted: Fri Nov 16, 2012 1:32 pm 
Offline

Joined: Mon Mar 26, 2012 2:45 pm
Posts: 113
Location: Bali, Indonesia
Image

:smartass: http://en.wikipedia.org/wiki/Precession_(mechanical) :smartass:

Monkeyburger

_________________
...finding my inner Onoda-kun...


Top
   
PostPosted: Fri Nov 16, 2012 6:40 pm 
Offline
in the industry

Joined: Thu Feb 05, 2004 3:53 am
Posts: 156
Location: Athens, GA
Left hand threads (counterclockwise to tighten) on the drive-side cups is strange as the friction from pedaling is clockwise which tends to loosen the cups..


Top
   
PostPosted: Fri Nov 16, 2012 6:49 pm 
Offline
User avatar

Joined: Sun May 10, 2009 3:31 pm
Posts: 445
Location: Russia, Moscow
ZeroG wrote:
friction from pedaling is clockwise which tends to loosen the cups..

It would, if we didn't have bearings inbetween cups and spindle. Luckily we do, so there is not enough friction transferred to overcome static friction between torqued BB cups threads and frame BB threads. As such the other thing we have to deal with is precession (see monkeyburger's post above) which is the reason for English thread standard.


Top
   
PostPosted: Fri Nov 16, 2012 7:04 pm 
Offline

Joined: Fri Oct 28, 2011 3:25 am
Posts: 1318
Location: United Kingdom of Great Britain and Northern Ireland
monkeyburger knows his stuff.

Its a wonder the Italians have perservered with their sub-standard, standard.


Top
   
Posted: Fri Nov 16, 2012 7:04 pm 


Top
   
 
PostPosted: Mon Nov 19, 2012 5:42 am 
Offline
User avatar

Joined: Thu Aug 25, 2005 7:09 pm
Posts: 1235
Location: In the industry
In the past, BB cups have nothing pressing them in other than the threads.

With today's crankset designs, this issue seems less relevant.

_________________
Fast falcons: http://www.youtube.com/watch?v=j3mTPEuFcWk" onclick="window.open(this.href);return false;
www.falcobike.com
Facebook: falcobikeglobal


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 8 posts ] 

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Need help on bottom bracket

in Road

poppiholla

3

428

Tue Jul 05, 2016 9:38 pm

poppiholla View the latest post

There are no new unread posts for this topic. Which GXP bottom bracket?

in Road

cnyn

8

684

Wed May 11, 2016 6:44 pm

topflightpro View the latest post

There are no new unread posts for this topic. What bottom bracket do I have?

in Road

G6612

3

375

Thu May 05, 2016 8:58 pm

Calnago View the latest post

There are no new unread posts for this topic. bottom bracket tool

in Road

goldielox

11

787

Sat Feb 13, 2016 3:38 pm

BRM View the latest post

There are no new unread posts for this topic. Best BB386 : GXP bottom bracket ?

in Road

stormur

14

834

Mon Jun 13, 2016 4:03 pm

Mr.Gib View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: No registered users and 10 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:  
Powered by phpBB® Forum Software © phpBB Limited