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


Go Back   > >

Framebuilders Thinking about a custom frame? Lugged vs Fillet Brazed. Different Frame materials? Newvex or Pacenti Lugs? why get a custom Road, Mountain, or Track Frame? Got a question about framebuilding? Lets discuss framebuilding at it's finest.

Reply
 
Thread Tools Search this Thread
Old 10-10-08, 08:40 AM   #1
Erzulis Boat
3rd Grade Dropout
Thread Starter
 
Erzulis Boat's Avatar
 
Join Date: Oct 2005
Location: Santa Barbara Calif.
Bikes:
Posts: 949
"Oversized" steel tubesets

I am probably going to make my next frameset (track geometry) with the OS Columbus (Nova) or some True Temper from HJ. Lugged construction.

I have not ridden any OS bikes, so what am I going to lose/gain here?

Are the rides "stiffer" due to increases TT/BT diameter, or do they kind of even it out with wall thickness so the ride is closer the "Standard" tubesets? By looking at the specs it seems that you gain stiffness, but still incur a weight penalty even if the walls are a tenth less, due to the greater diameter.

I would tend to think that this was done for cosmetics, but any advice on how to exploit the OS tubesets traits?
Erzulis Boat is offline   Reply With Quote
Old 10-10-08, 02:26 PM   #2
Nessism
Senior Member
 
Nessism's Avatar
 
Join Date: Jun 2004
Location: Torrance, CA
Bikes: Homebuilt steel
Posts: 2,332
STD tube frames, 1” top tube and 1.125” seat and down tube, are rare these days. One could go so far as to say that Oversize (OS) is the new standard – and has been for the last 15 years or so. There are lugs available for Super OS diameters as well these days: 1.25” top and seat tubes, and 1.375” down tube. Lots of choices.

In terms of stiffness/weight; as the tubes get larger, and thinner, the stiffness can remain constant while weight is reduced. For example, an OS frame with similar stiffness to a STD frame will weigh about - 1/3 lb. lighter. The key is to pick a tubeset to match the ride qualities you want. A couple of good ones for general purpose riding are Columbus Zona and Dedacciai COM12.5 (ZeroUno). Both will build into a lighter frame than the typical Columbus SL frame, while being slightly stiffer as well. One drawback to thin walled tubes needs to be considered: they dent more easily than thicker tubes. The thin tubes are made from stronger alloys, so the metal alloy is more dent resistant, but this does not fully make up for the fact that the tubes are thinner, thus they dent easier.

My own personal bikes (two of them) use Super OS tubes. I really like these bikes since they are stiffer than a similar weight OS frame. I’m not super strong, or heavy, but I hate chain rub so stiffness is important to me.

Hope this helps.
__________________
Becareful buying/selling bike parts on-line. I learned the hard way. :(

Good/Bad Trader Listing

Last edited by Nessism; 10-10-08 at 08:55 PM.
Nessism 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 05:37 PM.