Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

User Tag List

Reply
 
Thread Tools Search this Thread
Old 04-01-05, 01:10 PM   #1
Chazzmeister
Oh boy
Thread Starter
 
Join Date: Feb 2005
Location: Seattle, WA
Bikes:
Posts: 43
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Gnarly FGG Action

did anyone else see this jacked-up frame?

http://www.fixedgeargallery.com/2005/mar/Cb.htm


Steel is Real!
Chazzmeister is offline   Reply With Quote
Old 04-01-05, 01:36 PM   #2
flythebike
Wher'd u Get That Jacket?
 
flythebike's Avatar
 
Join Date: Sep 2004
Location: Somewhere in the Tubes
Bikes: Calfee Dragonfly, Lemond Poprad, Airborne Manhatten Project, Calfee Luna Fixie
Posts: 1,317
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Aluminum breaks. It has a finite fatigue life. It gets weaker and weaker throughout its life the more fatigue cycles it goes through and then it breaks. So you have to overbuild it to begin with to compensate for it getting weaker later on. That is the tradeoff for its light weight and reatively affordable nature.

If you want a frame that won't fail catastrophically, you'd better go with steel, titanium, or carbon.
flythebike is offline   Reply With Quote
Old 04-01-05, 01:43 PM   #3
BostonFixed
Banned.
 
Join Date: Oct 2004
Bikes:
Posts: 4,418
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I think the problem was beacuse, as the owner wrote, that it broke in the exact spot where a bolt was. The frame material being aluminum probably didn't help either....
BostonFixed is offline   Reply With Quote
Old 04-01-05, 01:44 PM   #4
baxtefer
Cornucopia of Awesomeness
 
baxtefer's Avatar
 
Join Date: Oct 2004
Location: not where i used to be
Bikes:
Posts: 4,847
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
yeah holes through your downtube can't help with stuctural integrity....
baxtefer is offline   Reply With Quote
Old 04-01-05, 01:47 PM   #5
BostonFixed
Banned.
 
Join Date: Oct 2004
Bikes:
Posts: 4,418
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by baxtefer
yeah holes through your aluminum downtube can't help with stuctural integrity....
I edited it so its better now...
BostonFixed is offline   Reply With Quote
Old 04-01-05, 02:13 PM   #6
Miracle Whip
The Alternative Dressing
 
Join Date: Jan 2004
Location: In the condiments section of your local grocer
Bikes:
Posts: 169
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by flythebike
If you want a frame that won't fail catastrophically, you'd better go with ............ carbon.
You're an idiot. More to the point, you're an idiot whose knowledge about frame materials would fit in a thimble.

But you're probably super cool on your fixie.
Miracle Whip is offline   Reply With Quote
Old 04-01-05, 02:21 PM   #7
flythebike
Wher'd u Get That Jacket?
 
flythebike's Avatar
 
Join Date: Sep 2004
Location: Somewhere in the Tubes
Bikes: Calfee Dragonfly, Lemond Poprad, Airborne Manhatten Project, Calfee Luna Fixie
Posts: 1,317
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yes, a hole in your ALUMINUM frame would definitely reduce the fatigue stregth of the frame and increase the likelyhood of such a catastrophic failure. He is lucky he wasn't injured or killed.
flythebike is offline   Reply With Quote
Old 04-01-05, 02:41 PM   #8
stevo
Senior Member
 
Join Date: Jun 2003
Bikes:
Posts: 997
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i agree al. has a finite fatigue life, and in theory in can break catastophically. Empriically, my al. frame has been ridden daily for over 16 years. On road and off. Gathousands of miles annually. No failures and I have full confidence in the frame. Likewise, must of us dont sweat the 'finite fatigue life' of our handlebars, which take a beating.

now, if i had throughbolted the downtube and the seattube, I may not have such confidence.
stevo is offline   Reply With Quote
Old 04-01-05, 02:44 PM   #9
flythebike
Wher'd u Get That Jacket?
 
flythebike's Avatar
 
Join Date: Sep 2004
Location: Somewhere in the Tubes
Bikes: Calfee Dragonfly, Lemond Poprad, Airborne Manhatten Project, Calfee Luna Fixie
Posts: 1,317
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Certainly a well constructed aluminum frame could last a lifetime. Or longer.
flythebike is offline   Reply With Quote
Old 04-01-05, 04:15 PM   #10
d_D
645f44
 
d_D's Avatar
 
Join Date: Sep 2003
Location: Oxford, Uk
Bikes:
Posts: 482
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by stevo
i agree al. has a finite fatigue life, and in theory in can break catastophically. Empriically, my al. frame has been ridden daily for over 16 years. On road and off. Gathousands of miles annually. No failures and I have full confidence in the frame. Likewise, must of us dont sweat the 'finite fatigue life' of our handlebars, which take a beating.
That is a problem with pretty much all frames not just alu.
Steel frames can fatigue and break suddenly. Build a steel frame so it won't and it will be too heavy.
d_D is offline   Reply With Quote
Old 04-01-05, 04:41 PM   #11
Chazzmeister
Oh boy
Thread Starter
 
Join Date: Feb 2005
Location: Seattle, WA
Bikes:
Posts: 43
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
but I think the point is that aluminum's progressive metal fatigure malleability is a lot less than steel. Steel (And other metals) can be bent back and forth a lot before they progressively get weak enough to snap. Aluminum has a lot less elasticity before breakage. Thats the point.
Chazzmeister is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 05:16 PM.