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another Ti question(4 posts)

another Ti questionjust wondering
Aug 22, 2001 3:45 AM
What does it mean when one refers to a frame material as being "worked" IS not Ti 3AL-2.5V the same as any other 3AL-2.5V. Can and does one frame builder change this material as they are building a frame. Is not 3AL-2.5V the preferred of Ti material.
re: another Ti questionG
Aug 22, 2001 5:29 AM
I am referencing my previous post here so what I meant by "worked" was that the Litespeed I owned had butted and tapered tubing while my new frame uses straight-gauged tubing throughout(although the down tube is ovalized). Newer Litespeeds use straight-gauged tubing as well, but it is shaped(squared, triangular, even 10-sided). The theory being that this shaped tubing will improve the ride quality, etc. Seems reasonable, but that is for persons more knowlegeable than I to argue. You can also go the tapered and butted tubing route with several frame manufacturers. Primary advantage here is weight savings. If you buy an American made ti frame then the titanium tubing probably comes from one of three companies(Sandvik, Anoctech, or Reynolds). 3/2.5 ti is preferred by most manufacturers for various reasons but other grades are used(CP and 6/4 come to mind). May I suggest you go to Merlins' website for a fine primer on titanium. My apologies in advance for the mispelling of company names. Hope this helps.
Some basic info?RhodyRider
Aug 22, 2001 6:00 AM
"Cold Working" of titanium alloys (and in fact most metals) increases the strength, generally. Perhaps a metallurgist can chime in with some real technical info; it has to do with grain structure and lots of other issues. The numbers you see in titanium descriptions indicate the percentage of alloying elements e.g. 3% Aluminum, 2.5% Vanadium, Remainder Titanium, or 6% Al/4% V, Rem Ti. "CP" (Commercially Pure, no significant alloying elements) has not been found to be a good choice for bicycle frames. Too "soft".
SEVENAD14
Aug 22, 2001 10:06 AM
Sevens brochure and website are also good sources of info on ti. The brochure is loaded with interesting and somewhat detailed stuff.