A Cycling & bikes forum. CycleBanter.com

Go Back   Home » CycleBanter.com forum » rec.bicycles » Techniques
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

Threadless BB Cartridges: Why/Why Not?



 
 
Thread Tools Display Modes
  #1  
Old February 24th 06, 07:03 PM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Threadless BB Cartridges: Why/Why Not?

Thanks to Werehatrack for introducing me to the concept...

Now it begs the question:
Why are BB shells threaded in the first place?
i.e. Why don't most bikes just come with threadless
already installed?

Sounds like there's a downside...
--
PeteCresswell
Ads
  #2  
Old February 24th 06, 09:33 PM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Threadless BB Cartridges: Why/Why Not?


(PeteCresswell) wrote:
Thanks to Werehatrack for introducing me to the concept...

Now it begs the question:
Why are BB shells threaded in the first place?
i.e. Why don't most bikes just come with threadless
already installed?

Sounds like there's a downside...


systems like that have been tried (merlin, klein, pinnarello), the
trick would be to settle on a standard.

it will also be denounced by the lugs and espressos crowd as a cost
cutting scheme.

  #3  
Old February 24th 06, 09:44 PM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Threadless BB Cartridges: Why/Why Not?

Pete Cresswell writes:

Thanks to Werehatrack for introducing me to the concept...


Now it begs the question:
Why are BB shells threaded in the first place?
i.e. Why don't most bikes just come with threadless
already installed?


Sounds like there's a downside...


I must have missed it but could you direct me to a web site where I
can see the cross section of a threadless BB? The only ones I know of
were on Ashtabula cranks and they had a larger diameter.

Jobst Brandt
  #4  
Old February 24th 06, 10:38 PM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Threadless BB Cartridges: Why/Why Not?


here's pinarello's version:

http://www.pinarello.com/eng/product...ology_gear.php

-Amit

  #6  
Old February 24th 06, 11:52 PM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Threadless BB Cartridges: Why/Why Not?

Amit Ghosh writes:

here's Pirandello's version:


http://www.pinarello.com/eng/product...ology_gear.php

Unfortunately the mechanism remains secret. What holds the spindle
radially or laterally and how is the spindle attached to the bearing.
Without a press fit, this will become a creaking rouge generating
interface as will the bearings inside the BB shell. As I mentioned in
another thread, what are these folks thinking when they build their
web sites. Their 3-D image is a useless fuzzy picture unlike a cross
section line drawing.

Jobst Brandt
  #7  
Old February 25th 06, 02:34 AM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Threadless BB Cartridges: Why/Why Not?


wrote in message
oups.com...
Mavic did a very successful one for many years.. it's disappearance is
probably the most unfortunate by-product of the take over.. NOS ones
turn up from time to time but I wish someone would buy or steal the
design and make new ones.


Nearly certain that the "Mavic" is still made, and marketed by Stronglight
these days.

Gary Jacobson
Rosendale, NY


  #9  
Old February 25th 06, 08:25 PM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Threadless BB Cartridges: Why/Why Not?

Andrew Muzi writes:

Thanks to Werehatrack for introducing me to the concept...
Now it begs the question:
Why are BB shells threaded in the first place?
i.e. Why don't most bikes just come with threadless
already installed?
Sounds like there's a downside...


I must have missed it but could you direct me to a web site where I
can see the cross section of a threadless BB? The only ones I know
of were on Ashtabula cranks and they had a larger diameter.


Surely, you recall the Mavic system of the eigties? Conical rings on
both sides screw onto a threaded Phil-ish cartridge. IN Mavic's
design, the frame gets milled with a 4mm chamfer on each end of the
BB. The later all-nylon-casing types (KSS brand) seem to work fine
without that chamfer.


I don't recall, and don't call me Shirley.

They are both more expensive to make and much more time consuming to
install. As such they can't be an OEM part and in today's world
that is a kiss of death. Low volume means high prices which leads
to low volume and therefore high prices, etc.


Picture reference please. I don't have much hope though because these
folks seldom show a cross section drawing where the function is
revealed. You might suspect they don't trust their patent protection.

Jobst Brandt
  #10  
Old February 25th 06, 08:40 PM posted to rec.bicycles.tech
external usenet poster
 
Posts: n/a
Default Threadless BB Cartridges: Why/Why Not?


aka Jobst Brandt but not Shirley wrote:
Andrew Muzi writes:

Thanks to Werehatrack for introducing me to the concept...
Now it begs the question:
Why are BB shells threaded in the first place?
i.e. Why don't most bikes just come with threadless
already installed?
Sounds like there's a downside...


I must have missed it but could you direct me to a web site where I
can see the cross section of a threadless BB? The only ones I know
of were on Ashtabula cranks and they had a larger diameter.


Surely, you recall the Mavic system of the eigties? Conical rings on
both sides screw onto a threaded Phil-ish cartridge. IN Mavic's
design, the frame gets milled with a 4mm chamfer on each end of the
BB. The later all-nylon-casing types (KSS brand) seem to work fine
without that chamfer.


I don't recall, and don't call me Shirley.

They are both more expensive to make and much more time consuming to
install. As such they can't be an OEM part and in today's world
that is a kiss of death. Low volume means high prices which leads
to low volume and therefore high prices, etc.


Picture reference please. I don't have much hope though because these
folks seldom show a cross section drawing where the function is
revealed. You might suspect they don't trust their patent protection.


Is this the referenced BB? See
http://www.bikepro.com/products/bottom_brackets/mavic.html.

--
Tom Sherman

 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Bad idea to upgrade to 1" threadless headset/fork? Dan Lenski Techniques 15 June 30th 05 04:02 PM
Threadless stems and carbon steerers in crashes George Herbert Walker Techniques 10 October 2nd 04 06:16 PM
handlebar height n crowley General 35 April 19th 04 07:12 PM
YST threadless headsets Ian Szekeres Techniques 5 February 25th 04 09:30 AM
Threadless headset questions/problems Scott Ghiz Techniques 4 February 18th 04 01:51 PM


All times are GMT +1. The time now is 12:18 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Copyright 2004-2022 CycleBanter.com.
The comments are property of their posters.