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Titanium spokes---- GOOD?(6 posts)

Titanium spokes---- GOOD?Bobha8
Sep 6, 2001 12:06 AM
I was thinking on building a wheelset up with these in a 3 cross pattern, I can't find much info on them for how easy they are to true. (and keep true) and what kind of ride do they give. does anyone know?
not GOOD I'm afraidJofa
Sep 6, 2001 5:22 AM
They're a little more flexy than steel spokes, but the difference is strictly academic: the ride will be no different to anything else. Their problem is the surface roughness of the material in the threads, which galls with the nipples when under tension and makes it very difficult to relieve residual twist effectively. They're expensive and the ultimate weight saving isn't worth it.
what about sapim cx-ray'sBobha8
Sep 6, 2001 10:47 AM
they are light and suposedly strong.
what about sapim cx-ray'sJofa
Sep 6, 2001 11:38 AM
I've never used these: the only information I could find is this:

http://www.sapim.be/en/frame.htm

They look as if they are aluminium alloy bonded to SS ends. There is mention only of SS but from the picture and the weight claims it looks like an AL centre section. Their claims are for a high resistance to fatigue but I can't understand their statistics properly:

http://www.sapim.be/en/frame.htm

They imply that their other designs will fail after a certain number of loadings, which is contrary to other reports that spokes should last indefinitely.

In any case if AL is the material then I would be suspicious about their fatigue resistance in this application. You have a saving of 50g per wheel over ordinary SS spokes which are known to last indefinitely and are readily replaceable. I'd rather not be the guinea-pig for these but maybe somebody with some extensive experience with them would like to comment.

Jofa
nope, solid stainless steel, just very butted.jw25
Sep 7, 2001 12:56 PM
I won't go into fatige here, because there's plenty of material available, and it's been done to death, but suffice it to say that the data Sapim gives indicates the relative fatigue life of their spokes. Without knowing their testing protocol, it's hard to relate that to other manufacturers.
Unfortunately, "normal" SS spokes don't last forever. They fatigue over time, though proper tensioning and butting will prolong this time. See "The Bicycle Wheel" by Jobst Brandt for fatigue data of stainless and steel spokes.
The CX-Rays are pretty pricey, but seeing as they've won the Tour de France several times, and Sapim's list of sponsored teams is quite noteworthy, I wouldn't hesitate to use them. Compared to ti spokes, the CX-Rays should build up better, last longer, and won't cost that much more.
Titanium spokes -- NOT GOOD!Kerry Irons
Sep 6, 2001 5:01 PM
Ti and spokes is an application that just has not worked out. They have a reputation for all kinds of problems with not much weight saved and severe cost penalty. Take a pass.